<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.irs.gov/efile" returnVersion="2020v4.1">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2022-01-21T13:48:56-06:00</ReturnTs>
    <TaxPeriodEndDt>2021-06-30</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>431985162</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>SMITH SULLIVAN &amp; BROWN PC</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>80 FLANDERS ROAD - SUITE 200</AddressLine1Txt>
        <CityNm>WESTBOROUGH</CityNm>
        <StateAbbreviationCd>MA</StateAbbreviationCd>
        <ZIPCd>01581</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990</ReturnTypeCd>
    <TaxPeriodBeginDt>2020-07-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>043237106</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>SILENT SPRING INSTITUTE INC</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>SILE</BusinessNameControlTxt>
      <PhoneNum>6173324288</PhoneNum>
      <USAddress>
        <AddressLine1Txt>320 NEVADA STREET SUITE 302</AddressLine1Txt>
        <CityNm>NEWTON</CityNm>
        <StateAbbreviationCd>MA</StateAbbreviationCd>
        <ZIPCd>02460</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>PATTI A STOLL</PersonNm>
      <PersonTitleTxt>CO-CHAIR OF THE BOARD</PersonTitleTxt>
      <PhoneNum>6173324288</PhoneNum>
      <SignatureDt>2022-01-21</SignatureDt>
      <DiscussWithPaidPreparerInd>1</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <SigningOfficerGrp>
      <PersonFullName>
        <PersonFirstNm>PATTI</PersonFirstNm>
        <PersonLastNm>STOLL</PersonLastNm>
      </PersonFullName>
      <SSN>999009999</SSN>
    </SigningOfficerGrp>
    <PreparerPersonGrp>
      <PreparerPersonNm>SANDRA M BROWN CPA</PreparerPersonNm>
      <PTIN>P01614103</PTIN>
      <PhoneNum>5088717178</PhoneNum>
      <PreparationDt>2022-01-20</PreparationDt>
    </PreparerPersonGrp>
    <AdditionalFilerInformation>
      <TrustedCustomerGrp>
        <TrustedCustomerCd>2</TrustedCustomerCd>
        <AuthenticationAssuranceLevelCd>AAL1</AuthenticationAssuranceLevelCd>
        <IdentityAssuranceLevelCd>IAL1</IdentityAssuranceLevelCd>
      </TrustedCustomerGrp>
    </AdditionalFilerInformation>
    <TaxYr>2020</TaxYr>
    <BuildTS>2022-09-23 18:48:47Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="7">
    <IRS990 documentId="RetDoc1038000001" referenceDocumentId="RetDoc1044400001">
      <PrincipalOfficerNm>PATTI A STOLL</PrincipalOfficerNm>
      <USAddress>
        <AddressLine1Txt>320 NEVADA STREET SUITE 302</AddressLine1Txt>
        <CityNm>NEWTON</CityNm>
        <StateAbbreviationCd>MA</StateAbbreviationCd>
        <ZIPCd>02460</ZIPCd>
      </USAddress>
      <GrossReceiptsAmt>4567265</GrossReceiptsAmt>
      <GroupReturnForAffiliatesInd>0</GroupReturnForAffiliatesInd>
      <Organization501c3Ind>X</Organization501c3Ind>
      <WebsiteAddressTxt>WWW.SILENTSPRING.ORG</WebsiteAddressTxt>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <FormationYr>1994</FormationYr>
      <LegalDomicileStateCd>MA</LegalDomicileStateCd>
      <ActivityOrMissionDesc>ADVANCING SCIENCE ON THE INFLUENCE OF ENVIRONMENTAL CHEMICALS ON WOMEN'S HEALTH, WITH A FOCUS ON BREAST CANCER PREVENTION.</ActivityOrMissionDesc>
      <VotingMembersGoverningBodyCnt>9</VotingMembersGoverningBodyCnt>
      <VotingMembersIndependentCnt>9</VotingMembersIndependentCnt>
      <TotalEmployeeCnt>26</TotalEmployeeCnt>
      <TotalVolunteersCnt>18</TotalVolunteersCnt>
      <TotalGrossUBIAmt>0</TotalGrossUBIAmt>
      <NetUnrelatedBusTxblIncmAmt>0</NetUnrelatedBusTxblIncmAmt>
      <PYContributionsGrantsAmt>3814878</PYContributionsGrantsAmt>
      <CYContributionsGrantsAmt>4560422</CYContributionsGrantsAmt>
      <PYProgramServiceRevenueAmt>0</PYProgramServiceRevenueAmt>
      <CYProgramServiceRevenueAmt>0</CYProgramServiceRevenueAmt>
      <PYInvestmentIncomeAmt>3162</PYInvestmentIncomeAmt>
      <CYInvestmentIncomeAmt>4293</CYInvestmentIncomeAmt>
      <PYOtherRevenueAmt>153488</PYOtherRevenueAmt>
      <CYOtherRevenueAmt>2550</CYOtherRevenueAmt>
      <PYTotalRevenueAmt>3971528</PYTotalRevenueAmt>
      <CYTotalRevenueAmt>4567265</CYTotalRevenueAmt>
      <PYGrantsAndSimilarPaidAmt>0</PYGrantsAndSimilarPaidAmt>
      <CYGrantsAndSimilarPaidAmt>0</CYGrantsAndSimilarPaidAmt>
      <PYBenefitsPaidToMembersAmt>0</PYBenefitsPaidToMembersAmt>
      <CYBenefitsPaidToMembersAmt>0</CYBenefitsPaidToMembersAmt>
      <PYSalariesCompEmpBnftPaidAmt>2091538</PYSalariesCompEmpBnftPaidAmt>
      <CYSalariesCompEmpBnftPaidAmt>2203419</CYSalariesCompEmpBnftPaidAmt>
      <PYTotalProfFndrsngExpnsAmt>23140</PYTotalProfFndrsngExpnsAmt>
      <CYTotalProfFndrsngExpnsAmt>41314</CYTotalProfFndrsngExpnsAmt>
      <CYTotalFundraisingExpenseAmt>280085</CYTotalFundraisingExpenseAmt>
      <PYOtherExpensesAmt>867133</PYOtherExpensesAmt>
      <CYOtherExpensesAmt>1248573</CYOtherExpensesAmt>
      <PYTotalExpensesAmt>2981811</PYTotalExpensesAmt>
      <CYTotalExpensesAmt>3493306</CYTotalExpensesAmt>
      <PYRevenuesLessExpensesAmt>989717</PYRevenuesLessExpensesAmt>
      <CYRevenuesLessExpensesAmt>1073959</CYRevenuesLessExpensesAmt>
      <TotalAssetsBOYAmt>2944340</TotalAssetsBOYAmt>
      <TotalAssetsEOYAmt>4263030</TotalAssetsEOYAmt>
      <TotalLiabilitiesBOYAmt>274789</TotalLiabilitiesBOYAmt>
      <TotalLiabilitiesEOYAmt>519520</TotalLiabilitiesEOYAmt>
      <NetAssetsOrFundBalancesBOYAmt>2669551</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>3743510</NetAssetsOrFundBalancesEOYAmt>
      <InfoInScheduleOPartIIIInd>X</InfoInScheduleOPartIIIInd>
      <MissionDesc>SILENT SPRING IS A NONPROFIT RESEARCH INSTITUTE DEDICATED TO ADVANCING SCIENCE ON THE INFLUENCE OF ENVIRONMENTAL CHEMICALS ON WOMEN'S HEALTH, WITH A FOCUS ON BREAST CANCER PREVENTION.</MissionDesc>
      <SignificantNewProgramSrvcInd>0</SignificantNewProgramSrvcInd>
      <SignificantChangeInd>0</SignificantChangeInd>
      <ExpenseAmt>2801303</ExpenseAmt>
      <RevenueAmt>2550</RevenueAmt>
      <Desc>SILENT SPRING INSTITUTE WAS FOUNDED IN 1994 TO INVESTIGATE ELEVATED BREAST CANCER RATES ON CAPE COD. SINCE THEN, THE INSTITUTE HAS BECOME A NATIONAL LEADER IN BREAST CANCER PREVENTION THROUGH ENVIRONMENTAL HEALTH RESEARCH AND THE STUDY OF ENDOCRINE DISRUPTING COMPOUNDS ("EDCS") AND THEIR INFLUENCE ON THE DISEASE. THE INSTITUTE HAS PUBLISHED MORE THAN 140 PEER-REVIEWED ARTICLES AND IS DEVELOPING NEW TECHNOLOGIES TO ACCELERATE THE IDENTIFICATION OF CANCER-CAUSING CHEMICALS IN OUR EVERYDAY ENVIRONMENTS AND THE TRANSITION TO SAFER CHEMICALS AND PRODUCTS. THESE SOLUTIONS HOLD PROMISE FOR DECREASING THE RISK AND INCIDENCE OF BREAST CANCER AND OTHER DISEASES. AMONG OUR ACCOMPLISHMENTS OVER THE PAST 27 YEARS ARE A NUMBER OF IMPORTANT "FIRSTS," INCLUDING: - FIRST TO DETECT EDCS, INCLUDING BPA, IN GROUNDWATER (1998).- FIRST TO MEASURE HOUSEHOLD EXPOSURE TO 30 EDCS, AND FIRST TO IDENTIFY FLAME RETARDANTS AS A HEALTH RISK IN U.S. HOMES (2003).- FIRST TO QUANTIFY THE PRESENCE OF 55 EDCS IN 213 CONSUMER PRODUCTS (2012). - FIRST TO COMPILE A COMPREHENSIVE DATABASE OF BREAST CARCINOGENS (2007) AND THE FIRST TO DEMONSTRATE THAT FOOD PACKAGING IS A MAJOR SOURCE OF EXPOSURE TO BPA AND PHTHALATES (2011).- FIRST TO MEASURE TOXIC PFAS CHEMICALS IN DRINKING WATER ON CAPE COD-UNREGULATED CONTAMINANTS FOUND IN 75% OF PUBLIC WATER DRINKING SUPPLIES (2010).- FIRST TO DEMONSTRATE A LINK BETWEEN CALIFORNIA FURNITURE FLAMMABILITY STANDARDS AND INCREASED LEVELS OF FLAME RETARDANTS IN PEOPLE'S BLOOD AND URINE, AS WELL AS THEIR HOUSEHOLD DUST (2008); FIRST TO SUBSEQUENTLY DOCUMENT LEVELS OF NEW FLAME RETARDANTS IN CALIFORNIA HOMES FOLLOWING THE BAN OF PBDES (2012); AND FIRST TO FIND STUDENTS ON COLLEGE CAMPUSES ARE EXPOSED TO HIGH LEVELS OF TOXIC FLAME RETARDANTS IN DORMITORY DUST, INCLUDING SOME OF THE HIGHEST LEVELS EVER REPORTED (2017).- FIRST TO DEMONSTRATE THAT TOXIC AND HIGHLY PERSISTENT PFAS CHEMICALS ARE COMMONLY FOUND IN U.S. FAST FOOD PACKAGING (2017). - FIRST TO MEASURE CONCENTRATIONS OF EDCS IN A VARIETY OF HAIR PRODUCTS MARKETED TO BLACK WOMEN (2018).- FIRST STUDY TO OBSERVE AN ASSOCIATION BETWEEN DIFFERENT SOURCES OF FOOD AND PFAS EXPOSURES IN THE U.S. POPULATION (2019).- FIRST STUDY TO IDENTIFY HUNDREDS OF CHEMICALS, MANY IN CONSUMER PRODUCTS, THAT ACT BY INCREASING THE PRODUCTION OF ESTROGEN AND PROGESTERONE, WHICH ARE KNOWN RISK FACTORS FOR BREAST CANCER (2021).OUR CURRENT RESEARCH PROJECTS INCLUDE:- SAFER CHEMICALS PROGRAM: BUILDING ON NATIONAL INITIATIVES FOR CHEMICAL SAFETY SCREENING, DEVELOPING INNOVATIVE METHODS TO RAPIDLY SCREEN CHEMICALS FOR EFFECTS ON BREAST DEVELOPMENT AND BREAST CANCER (E.G. BCSCREEN).- PFAS CONTAMINANTS IN DRINKING WATER: UNDERSTANDING HOW PEOPLE ARE EXPOSED TO PFAS CHEMICALS THROUGH DRINKING WATER AND HOW THESE CHEMICALS AFFECT HUMAN HEALTH.- LEAD AND HEALTHY HOMES: EVALUATING THE IMPACT OF LEAD REMEDIATION PROGRAMS ON REDUCING EXPOSURES TO OTHER CHEMICAL HAZARDS IN THE HOME, INCLUDING PESTICIDES, PHTHALATES, AND FLAME RETARDANTS. - CONSUMER PRODUCTS AND EXPOSURE DISPARITIES: TESTING CONSUMER PRODUCTS COMMONLY USED BY BLACK AND LATINA WOMEN FOR CHEMICALS THAT CONTRIBUTE TO BREAST CANCER, AND EXAMINING RACIAL AND ETHNIC DIFFERENCES IN PRODUCT USE TO BETTER UNDERSTAND DISPARITIES IN EXPOSURE.- INFORMING CHEMICAL SAFETY POLICIES: PROVIDING DECISION-MAKERS AND PARTNER ORGANIZATIONS WITH INDEPENDENT SCIENTIFIC EXPERTISE TO HELP INFORM CHEMICAL POLICIES AND REGULATIONS THAT BETTER PROTECT PUBLIC HEALTH.- EARLY LIFE EXPOSURES TO ENVIRONMENTAL CHEMICALS: INVESTIGATING WHETHER EXPOSURE TO EDCS DURING ADOLESCENCE INCREASES SUSCEPTIBILITY TO BREAST CANCER IN ADULTHOOD.- WOMEN FIREFIGHTERS BIOMONITORING COLLABORATIVE: INVESTIGATING ON-THE-JOB EXPOSURES TO BREAST CARCINOGENS IN FEMALE FIREFIGHTERS THROUGH A STUDY OF THE HUMAN EXPOSOME. - PERSONAL EXPOSURE RIGHT-TO-KNOW: DEVELOPING AND EVALUATING ETHICAL AND EFFECTIVE METHODS FOR REPORTING RESULTS TO PARTICIPANTS IN BIOMONITORING AND ENVIRONMENTAL EXPOSURE STUDIES.SILENT SPRING INSTITUTE'S SAFER CHEMICALS PROGRAM (HTTPS://SILENTSPRING.ORG/OUR-SCIENCE/HOW-DO-WE-IDENTIFY-CHEMICALS-CAUSE-BREAST-CANCER) ENCOMPASSES A NUMBER OF RESEARCH EFFORTS FOCUSED ON DEVELOPING COST-EFFECTIVE, EFFICIENT METHODS TO IDENTIFY BREAST CARCINOGENS. THE ULTIMATE GOAL OF THIS RESEARCH IS TO SHIFT THE BURDEN OF EXPOSURE REDUCTION AND PREVENTION FROM CONSUMERS TO INDUSTRY AND REGULATORY AGENCIES BY ARMING THE LATTER WITH THE NECESSARY TOOLS AND KNOWLEDGE TO ENSURE THAT UNSAFE CHEMICALS NEVER MAKE THEIR WAY INTO CONSUMER PRODUCTS AND THE ENVIRONMENT. GIFTS MADE TO THE SAFER CHEMICALS PROGRAM COLLECTIVELY MOVE SILENT SPRING INSTITUTE CLOSER TO THIS GOAL, AND THEIR USE IS UNRESTRICTED WITHIN THIS PROGRAM. ADDITIONAL INFORMATION ABOUT THIS BODY OF RESEARCH CAN BE FOUND AT WWW.SILENTSPRING.ORG/SUPPORT-OUR-WORK/SILENT-SPRINGS-SAFER-CHEMICALS-PROGRAM. ALSO OF NOTE, SILENT SPRING CREATED A FREE MOBILE APP CALLED DETOX ME THAT OFFERS CONSUMERS SCIENCE-BASED TIPS ON HOW TO AVOID HARMFUL CHEMICALS IN CONSUMER PRODUCTS AND LEAD A HEALTHIER LIFE (HTTPS://SILENTSPRING.ORG/DETOX-ME-APP-TIPS-HEALTHIER-LIVING). TO DATE, THE APP HAS MORE THAN 170,000 USERS, IS AVAILABLE IN ENGLISH AND SPANISH, AND CAN BE ACCESSED THROUGH A WEB BROWSER. IN 2016, WE LAUNCHED DETOX ME ACTION KIT, THE FIRST CROWDFUNDED BIOMONITORING STUDY TO ASSESS THE U.S. POPULATION'S EXPOSURE TO EDCS IN EVERYDAY CONSUMER ITEMS AND TO ENGAGE CONSUMERS IN REDUCING THEIR EXPOSURES. IN 2020, WE DEVELOPED A FREE ONLINE TOOL (PRIVATEWELLS.SILENTSPRING.ORG/) THAT HELPS PRIVATE WELL OWNERS UNDERSTAND THEIR WATER TEST RESULTS AND LEARN HOW TO REDUCE THEIR EXPOSURES TO HARMFUL CONTAMINANTS. WE ALSO LAUNCHED AN INTERACTIVE TOOL THROUGH OUR PFAS EXCHANGE WEBSITE (PFAS-EXCHANGE.ORG/) THAT HELPS PEOPLE WHO HAVE HAD THEIR BLOOD OR DRINKING WATER TESTED FOR PFAS INTERPRET THEIR RESULTS. THE SITE PROVIDES EDUCATIONAL RESOURCES ON PFAS AND INFORMATION FOR COMMUNITY GROUPS AFFECTED BY CONTAMINATION. THESE ADVANCES COMBINED HAVE EMPOWERED CONSUMERS TO MAKE BETTER CHOICES AND HAVE HELPED STRENGTHEN POLICIES THAT PROTECT PUBLIC HUMAN HEALTH BY REDUCING HAZARDOUS EXPOSURES AND ENCOURAGING THE TRANSITION TO SAFER CHEMICALS. OUR OUTREACH AND COMMUNICATIONS PROGRAM LINKS OUR RESEARCH WITH PUBLIC HEALTH POLICY AND INFORMS INDIVIDUALS AND COMMUNITIES. OUTREACH INCLUDES A POPULAR WEBSITE, LAY SUMMARIES OF OUR SCIENTIFIC STUDIES, AN E-NEWSLETTER, TIPS FOR CONSUMERS, AND A GROWING PRESENCE ON SOCIAL MEDIA. EVERY YEAR, OUR RESEARCH TEAM PARTICIPATES IN DOZENS OF ADVISORY PANELS, CONFERENCES, SEMINARS AND COMMUNITY EVENTS ACROSS THE COUNTRY. OUR RESEARCH HAS RECEIVED WIDESPREAD COVERAGE BY NATIONAL NEWS MEDIA OUTLETS INCLUDING THE NEW YORK TIMES, BLOOMBERG, CNN, TIME MAGAZINE, WASHINGTON POST, BOSTON GLOBE, NPR, CBS NEWS, BBC WORLD NEWS, THE GUARDIAN, HUFFINGTON POST, SCIENTIFIC AMERICAN AND DOZENS MORE.</Desc>
      <TotalProgramServiceExpensesAmt>2801303</TotalProgramServiceExpensesAmt>
      <DescribedInSection501c3Ind referenceDocumentId="RetDoc1039100001">1</DescribedInSection501c3Ind>
      <ScheduleBRequiredInd referenceDocumentId="RetDoc1234500001">1</ScheduleBRequiredInd>
      <PoliticalCampaignActyInd>0</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>0</LobbyingActivitiesInd>
      <SubjectToProxyTaxInd>0</SubjectToProxyTaxInd>
      <DonorAdvisedFundInd referenceDocumentId="RetDoc1040000001">0</DonorAdvisedFundInd>
      <ConservationEasementsInd referenceDocumentId="RetDoc1040000001">0</ConservationEasementsInd>
      <CollectionsOfArtInd referenceDocumentId="RetDoc1040000001">0</CollectionsOfArtInd>
      <CreditCounselingInd referenceDocumentId="RetDoc1040000001">0</CreditCounselingInd>
      <DonorRstrOrQuasiEndowmentsInd>0</DonorRstrOrQuasiEndowmentsInd>
      <ReportLandBuildingEquipmentInd referenceDocumentId="RetDoc1040000001">1</ReportLandBuildingEquipmentInd>
      <ReportInvestmentsOtherSecInd referenceDocumentId="RetDoc1040000001">0</ReportInvestmentsOtherSecInd>
      <ReportProgramRelatedInvstInd referenceDocumentId="RetDoc1040000001">0</ReportProgramRelatedInvstInd>
      <ReportOtherAssetsInd referenceDocumentId="RetDoc1040000001">0</ReportOtherAssetsInd>
      <ReportOtherLiabilitiesInd referenceDocumentId="RetDoc1040000001">0</ReportOtherLiabilitiesInd>
      <IncludeFIN48FootnoteInd referenceDocumentId="RetDoc1040000001">0</IncludeFIN48FootnoteInd>
      <IndependentAuditFinclStmtInd referenceDocumentId="RetDoc1040000001">1</IndependentAuditFinclStmtInd>
      <ConsolidatedAuditFinclStmtInd referenceDocumentId="RetDoc1040000001">0</ConsolidatedAuditFinclStmtInd>
      <SchoolOperatingInd>0</SchoolOperatingInd>
      <ForeignOfficeInd>0</ForeignOfficeInd>
      <ForeignActivitiesInd>0</ForeignActivitiesInd>
      <MoreThan5000KToOrgInd>0</MoreThan5000KToOrgInd>
      <MoreThan5000KToIndividualsInd>0</MoreThan5000KToIndividualsInd>
      <ProfessionalFundraisingInd referenceDocumentId="RetDoc1041200001">1</ProfessionalFundraisingInd>
      <FundraisingActivitiesInd referenceDocumentId="RetDoc1041200001">0</FundraisingActivitiesInd>
      <GamingActivitiesInd referenceDocumentId="RetDoc1041200001">0</GamingActivitiesInd>
      <OperateHospitalInd>0</OperateHospitalInd>
      <GrantsToOrganizationsInd>0</GrantsToOrganizationsInd>
      <GrantsToIndividualsInd>0</GrantsToIndividualsInd>
      <ScheduleJRequiredInd referenceDocumentId="RetDoc1042400001">1</ScheduleJRequiredInd>
      <TaxExemptBondsInd>0</TaxExemptBondsInd>
      <EngagedInExcessBenefitTransInd>0</EngagedInExcessBenefitTransInd>
      <PYExcessBenefitTransInd>0</PYExcessBenefitTransInd>
      <LoanOutstandingInd>0</LoanOutstandingInd>
      <GrantToRelatedPersonInd>0</GrantToRelatedPersonInd>
      <BusinessRlnWithOrgMemInd>0</BusinessRlnWithOrgMemInd>
      <BusinessRlnWithFamMemInd>0</BusinessRlnWithFamMemInd>
      <BusinessRlnWith35CtrlEntInd>0</BusinessRlnWith35CtrlEntInd>
      <DeductibleNonCashContriInd>0</DeductibleNonCashContriInd>
      <DeductibleArtContributionInd>0</DeductibleArtContributionInd>
      <TerminateOperationsInd>0</TerminateOperationsInd>
      <PartialLiquidationInd>0</PartialLiquidationInd>
      <DisregardedEntityInd>0</DisregardedEntityInd>
      <RelatedEntityInd>0</RelatedEntityInd>
      <RelatedOrganizationCtrlEntInd>0</RelatedOrganizationCtrlEntInd>
      <TrnsfrExmptNonChrtblRltdOrgInd>0</TrnsfrExmptNonChrtblRltdOrgInd>
      <ActivitiesConductedPrtshpInd>0</ActivitiesConductedPrtshpInd>
      <ScheduleORequiredInd>1</ScheduleORequiredInd>
      <IRPDocumentCnt>22</IRPDocumentCnt>
      <IRPDocumentW2GCnt>0</IRPDocumentW2GCnt>
      <EmployeeCnt>26</EmployeeCnt>
      <EmploymentTaxReturnsFiledInd>1</EmploymentTaxReturnsFiledInd>
      <UnrelatedBusIncmOverLimitInd>0</UnrelatedBusIncmOverLimitInd>
      <ForeignFinancialAccountInd>0</ForeignFinancialAccountInd>
      <ProhibitedTaxShelterTransInd>0</ProhibitedTaxShelterTransInd>
      <TaxablePartyNotificationInd>0</TaxablePartyNotificationInd>
      <NondeductibleContributionsInd>0</NondeductibleContributionsInd>
      <QuidProQuoContributionsInd>0</QuidProQuoContributionsInd>
      <Form8282PropertyDisposedOfInd>0</Form8282PropertyDisposedOfInd>
      <RcvFndsToPayPrsnlBnftCntrctInd>0</RcvFndsToPayPrsnlBnftCntrctInd>
      <PayPremiumsPrsnlBnftCntrctInd>0</PayPremiumsPrsnlBnftCntrctInd>
      <IndoorTanningServicesInd>0</IndoorTanningServicesInd>
      <SubjToTaxRmnrtnExPrchtPymtInd>0</SubjToTaxRmnrtnExPrchtPymtInd>
      <SubjectToExcsTaxNetInvstIncInd>0</SubjectToExcsTaxNetInvstIncInd>
      <InfoInScheduleOPartVIInd>X</InfoInScheduleOPartVIInd>
      <GoverningBodyVotingMembersCnt>9</GoverningBodyVotingMembersCnt>
      <IndependentVotingMemberCnt>9</IndependentVotingMemberCnt>
      <FamilyOrBusinessRlnInd>0</FamilyOrBusinessRlnInd>
      <DelegationOfMgmtDutiesInd>0</DelegationOfMgmtDutiesInd>
      <ChangeToOrgDocumentsInd>0</ChangeToOrgDocumentsInd>
      <MaterialDiversionOrMisuseInd>0</MaterialDiversionOrMisuseInd>
      <MembersOrStockholdersInd>0</MembersOrStockholdersInd>
      <ElectionOfBoardMembersInd>0</ElectionOfBoardMembersInd>
      <DecisionsSubjectToApprovaInd>0</DecisionsSubjectToApprovaInd>
      <MinutesOfGoverningBodyInd>1</MinutesOfGoverningBodyInd>
      <MinutesOfCommitteesInd>1</MinutesOfCommitteesInd>
      <OfficerMailingAddressInd>0</OfficerMailingAddressInd>
      <LocalChaptersInd>0</LocalChaptersInd>
      <Form990ProvidedToGvrnBodyInd>1</Form990ProvidedToGvrnBodyInd>
      <ConflictOfInterestPolicyInd>1</ConflictOfInterestPolicyInd>
      <AnnualDisclosureCoveredPrsnInd>1</AnnualDisclosureCoveredPrsnInd>
      <RegularMonitoringEnfrcInd>1</RegularMonitoringEnfrcInd>
      <WhistleblowerPolicyInd>1</WhistleblowerPolicyInd>
      <DocumentRetentionPolicyInd>1</DocumentRetentionPolicyInd>
      <CompensationProcessCEOInd>1</CompensationProcessCEOInd>
      <CompensationProcessOtherInd>1</CompensationProcessOtherInd>
      <InvestmentInJointVentureInd>0</InvestmentInJointVentureInd>
      <StatesWhereCopyOfReturnIsFldCd>MA</StatesWhereCopyOfReturnIsFldCd>
      <StatesWhereCopyOfReturnIsFldCd>CA</StatesWhereCopyOfReturnIsFldCd>
      <UponRequestInd>X</UponRequestInd>
      <BooksInCareOfDetail>
        <BusinessName>
          <BusinessNameLine1Txt>DIANE CZWAKIEL</BusinessNameLine1Txt>
        </BusinessName>
        <PhoneNum>6173324288</PhoneNum>
        <USAddress>
          <AddressLine1Txt>320 NEVADA STREET SUITE 302</AddressLine1Txt>
          <CityNm>NEWTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02460</ZIPCd>
        </USAddress>
      </BooksInCareOfDetail>
      <Form990PartVIISectionAGrp>
        <PersonNm>JEANNE MOCKARD CFA</PersonNm>
        <TitleTxt>BOARD MEMBER</TitleTxt>
        <AverageHoursPerWeekRt>1.50</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>GEORGIA MCGAUGHEY PHD</PersonNm>
        <TitleTxt>TREASURER</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JENNIFER GORKE</PersonNm>
        <TitleTxt>BOARD MEMBER</TitleTxt>
        <AverageHoursPerWeekRt>0.25</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>MARGARET KRIPKE PHD</PersonNm>
        <TitleTxt>BOARD MEMBER</TitleTxt>
        <AverageHoursPerWeekRt>0.50</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>PATTI A STOLL</PersonNm>
        <TitleTxt>CO-CHAIR</TitleTxt>
        <AverageHoursPerWeekRt>1.50</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>CATHIE RAGOVIN MD</PersonNm>
        <TitleTxt>CO-CHAIR</TitleTxt>
        <AverageHoursPerWeekRt>1.50</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>CINDY SHULAK-ROME</PersonNm>
        <TitleTxt>CLERK</TitleTxt>
        <AverageHoursPerWeekRt>0.25</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>SARAH DEVAN</PersonNm>
        <TitleTxt>BOARD MEMBER</TitleTxt>
        <AverageHoursPerWeekRt>0.50</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>LISA GOODWIN-ROBBINS RA CCS LEED</PersonNm>
        <TitleTxt>BOARD MEMBER</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>DEBRA DREW DEVAUGHN JD</PersonNm>
        <TitleTxt>FORMER BOARD MEMBER</TitleTxt>
        <AverageHoursPerWeekRt>0.10</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JULIA BRODY</PersonNm>
        <TitleTxt>EXECUTIVE DIRECTOR/SENIOR</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>179878</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>21600</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>RUTHANN RUDEL</PersonNm>
        <TitleTxt>DIRECTOR OF RESEARCH</TitleTxt>
        <AverageHoursPerWeekRt>37.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>121235</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>18628</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>CHRISTOPHER SWARTZ</PersonNm>
        <TitleTxt>MANAGING DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>117889</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>13004</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>RACHEL SARVEY</PersonNm>
        <TitleTxt>DIRECTOR OF DEVELOPMENT</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>111984</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>17210</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>DIANE CZWAKIEL</PersonNm>
        <TitleTxt>DIRECTOR OF FINANCE &amp; ADMINISTRATION</TitleTxt>
        <AverageHoursPerWeekRt>32.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>102624</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>21205</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>633610</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>91647</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>5</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>NORTHEASTERN UNIVERSITY</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>360 HUNTINGTON AVENUE</AddressLine1Txt>
            <CityNm>BOSTON</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02115</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>SUBCONTRACTOR</ServicesDesc>
        <CompensationAmt>132713</CompensationAmt>
      </ContractorCompensationGrp>
      <CntrctRcvdGreaterThan100KCnt>1</CntrctRcvdGreaterThan100KCnt>
      <GovernmentGrantsAmt>1870485</GovernmentGrantsAmt>
      <AllOtherContributionsAmt>2689937</AllOtherContributionsAmt>
      <TotalContributionsAmt>4560422</TotalContributionsAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>4293</TotalRevenueColumnAmt>
        <ExclusionAmt>4293</ExclusionAmt>
      </InvestmentIncomeGrp>
      <OtherRevenueMiscGrp>
        <Desc>HONORARIUMS</Desc>
        <BusinessCd>541700</BusinessCd>
        <TotalRevenueColumnAmt>2550</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>2550</RelatedOrExemptFuncIncomeAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueTotalAmt>2550</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>4567265</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>2550</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>4293</ExclusionAmt>
      </TotalRevenueGrp>
      <InfoInScheduleOPartIXInd>X</InfoInScheduleOPartIXInd>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>190656</TotalAmt>
        <ProgramServicesAmt>142107</ProgramServicesAmt>
        <ManagementAndGeneralAmt>48549</ManagementAndGeneralAmt>
      </CompCurrentOfcrDirectorsGrp>
      <OtherSalariesAndWagesGrp>
        <TotalAmt>1565049</TotalAmt>
        <ProgramServicesAmt>1217520</ProgramServicesAmt>
        <ManagementAndGeneralAmt>228189</ManagementAndGeneralAmt>
        <FundraisingAmt>119340</FundraisingAmt>
      </OtherSalariesAndWagesGrp>
      <PensionPlanContributionsGrp>
        <TotalAmt>84222</TotalAmt>
        <ProgramServicesAmt>67241</ProgramServicesAmt>
        <ManagementAndGeneralAmt>9935</ManagementAndGeneralAmt>
        <FundraisingAmt>7046</FundraisingAmt>
      </PensionPlanContributionsGrp>
      <OtherEmployeeBenefitsGrp>
        <TotalAmt>234272</TotalAmt>
        <ProgramServicesAmt>186317</ProgramServicesAmt>
        <ManagementAndGeneralAmt>29608</ManagementAndGeneralAmt>
        <FundraisingAmt>18347</FundraisingAmt>
      </OtherEmployeeBenefitsGrp>
      <PayrollTaxesGrp>
        <TotalAmt>129220</TotalAmt>
        <ProgramServicesAmt>102497</ProgramServicesAmt>
        <ManagementAndGeneralAmt>17070</ManagementAndGeneralAmt>
        <FundraisingAmt>9653</FundraisingAmt>
      </PayrollTaxesGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>1100</TotalAmt>
        <ProgramServicesAmt>1100</ProgramServicesAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>35000</TotalAmt>
        <ManagementAndGeneralAmt>35000</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesProfFundraising>
        <TotalAmt>41314</TotalAmt>
        <FundraisingAmt>41314</FundraisingAmt>
      </FeesForServicesProfFundraising>
      <FeesForServicesOtherGrp>
        <TotalAmt>786790</TotalAmt>
        <ProgramServicesAmt>755814</ProgramServicesAmt>
        <ManagementAndGeneralAmt>13267</ManagementAndGeneralAmt>
        <FundraisingAmt>17709</FundraisingAmt>
      </FeesForServicesOtherGrp>
      <OfficeExpensesGrp>
        <TotalAmt>84307</TotalAmt>
        <ProgramServicesAmt>58700</ProgramServicesAmt>
        <ManagementAndGeneralAmt>2788</ManagementAndGeneralAmt>
        <FundraisingAmt>22819</FundraisingAmt>
      </OfficeExpensesGrp>
      <InformationTechnologyGrp>
        <TotalAmt>16098</TotalAmt>
        <ProgramServicesAmt>16098</ProgramServicesAmt>
      </InformationTechnologyGrp>
      <OccupancyGrp>
        <TotalAmt>187486</TotalAmt>
        <ProgramServicesAmt>154374</ProgramServicesAmt>
        <ManagementAndGeneralAmt>19170</ManagementAndGeneralAmt>
        <FundraisingAmt>13942</FundraisingAmt>
      </OccupancyGrp>
      <TravelGrp>
        <TotalAmt>2665</TotalAmt>
        <ProgramServicesAmt>2403</ProgramServicesAmt>
        <FundraisingAmt>262</FundraisingAmt>
      </TravelGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>1567</TotalAmt>
        <ProgramServicesAmt>1548</ProgramServicesAmt>
        <ManagementAndGeneralAmt>11</ManagementAndGeneralAmt>
        <FundraisingAmt>8</FundraisingAmt>
      </ConferencesMeetingsGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>30816</TotalAmt>
        <ProgramServicesAmt>24961</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3390</ManagementAndGeneralAmt>
        <FundraisingAmt>2465</FundraisingAmt>
      </DepreciationDepletionGrp>
      <InsuranceGrp>
        <TotalAmt>7093</TotalAmt>
        <ProgramServicesAmt>5724</ProgramServicesAmt>
        <ManagementAndGeneralAmt>804</ManagementAndGeneralAmt>
        <FundraisingAmt>565</FundraisingAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>PROGRAM SUPPLIES</Desc>
        <TotalAmt>51113</TotalAmt>
        <ProgramServicesAmt>51113</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>EVENTS</Desc>
        <TotalAmt>23119</TotalAmt>
        <FundraisingAmt>23119</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>MISCELLANEOUS</Desc>
        <TotalAmt>17297</TotalAmt>
        <ProgramServicesAmt>13219</ProgramServicesAmt>
        <ManagementAndGeneralAmt>677</ManagementAndGeneralAmt>
        <FundraisingAmt>3401</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>RECRUITMENT</Desc>
        <TotalAmt>4122</TotalAmt>
        <ProgramServicesAmt>567</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3460</ManagementAndGeneralAmt>
        <FundraisingAmt>95</FundraisingAmt>
      </OtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>3493306</TotalAmt>
        <ProgramServicesAmt>2801303</ProgramServicesAmt>
        <ManagementAndGeneralAmt>411918</ManagementAndGeneralAmt>
        <FundraisingAmt>280085</FundraisingAmt>
      </TotalFunctionalExpensesGrp>
      <CashNonInterestBearingGrp>
        <BOYAmt>4077</BOYAmt>
        <EOYAmt>9128</EOYAmt>
      </CashNonInterestBearingGrp>
      <SavingsAndTempCashInvstGrp>
        <BOYAmt>2216573</BOYAmt>
        <EOYAmt>2852012</EOYAmt>
      </SavingsAndTempCashInvstGrp>
      <PledgesAndGrantsReceivableGrp>
        <BOYAmt>596336</BOYAmt>
        <EOYAmt>1291558</EOYAmt>
      </PledgesAndGrantsReceivableGrp>
      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>48239</BOYAmt>
        <EOYAmt>57903</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <LandBldgEquipCostOrOtherBssAmt>180726</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>128297</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>79115</BOYAmt>
        <EOYAmt>52429</EOYAmt>
      </LandBldgEquipBasisNetGrp>
      <TotalAssetsGrp>
        <BOYAmt>2944340</BOYAmt>
        <EOYAmt>4263030</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>258534</BOYAmt>
        <EOYAmt>495862</EOYAmt>
      </AccountsPayableAccrExpnssGrp>
      <DeferredRevenueGrp>
        <BOYAmt>16255</BOYAmt>
        <EOYAmt>23658</EOYAmt>
      </DeferredRevenueGrp>
      <TotalLiabilitiesGrp>
        <BOYAmt>274789</BOYAmt>
        <EOYAmt>519520</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>2369641</BOYAmt>
        <EOYAmt>2753441</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <DonorRestrictionNetAssetsGrp>
        <BOYAmt>299910</BOYAmt>
        <EOYAmt>990069</EOYAmt>
      </DonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>2669551</BOYAmt>
        <EOYAmt>3743510</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>2944340</BOYAmt>
        <EOYAmt>4263030</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>1073959</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>1</FederalGrantAuditRequiredInd>
      <FederalGrantAuditPerformedInd>1</FederalGrantAuditPerformedInd>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PublicOrganization170Ind>X</PublicOrganization170Ind>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>1453932</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>2322244</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>2388576</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>3814878</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>4560422</CurrentTaxYearAmt>
        <TotalAmt>14540052</TotalAmt>
      </GiftsGrantsContriRcvd170Grp>
      <TotalCalendarYear170Grp>
        <CurrentTaxYearMinus4YearsAmt>1453932</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>2322244</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>2388576</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>3814878</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>4560422</CurrentTaxYearAmt>
        <TotalAmt>14540052</TotalAmt>
      </TotalCalendarYear170Grp>
      <SubstantialContributorsTotAmt>386927</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>14153125</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>5967</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>1739</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>2711</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>3162</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>4293</CurrentTaxYearAmt>
        <TotalAmt>17872</TotalAmt>
      </GrossInvestmentIncome170Grp>
      <OtherIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>10450</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>1387</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>1305</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>4566</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>2550</CurrentTaxYearAmt>
        <TotalAmt>20258</TotalAmt>
      </OtherIncome170Grp>
      <TotalSupportAmt>14578182</TotalSupportAmt>
      <GrossReceiptsRltdActivitiesAmt>908612</GrossReceiptsRltdActivitiesAmt>
      <PublicSupportCY170Pct>0.97080</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.94840</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>SCHEDULE A, PART II, LINE 10, EXPLANATION OF OTHER INCOME:</FormAndLineReferenceDesc>
        <ExplanationTxt>HONORARIUMS - 2016 AMOUNT: $ 10,450. 2017 AMOUNT: $ 1,287. 2018 AMOUNT: $ 1,305. 2019 AMOUNT: $ 4,566. 2020 AMOUNT: $ 2,550. OTHER INCOME - 2017 AMOUNT: $ 100.</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="RetDoc1234500001">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>36953</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>28595</DepreciationAmt>
        <BookValueAmt>8358</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>143773</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>99702</DepreciationAmt>
        <BookValueAmt>44071</BookValueAmt>
      </EquipmentGrp>
      <TotalBookValueLandBuildingsAmt>52429</TotalBookValueLandBuildingsAmt>
      <TotalRevEtcAuditedFinclStmtAmt>4567265</TotalRevEtcAuditedFinclStmtAmt>
      <RevenueNotReportedAmt>0</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>4567265</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>4567265</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>3493306</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>3493306</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>3493306</TotalExpensesPerForm990Amt>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="RetDoc1041200001">
      <MailSolicitationsInd>X</MailSolicitationsInd>
      <EmailSolicitationsInd>X</EmailSolicitationsInd>
      <InPersonSolicitationsInd>X</InPersonSolicitationsInd>
      <SolicitationOfNonGovtGrantsInd>X</SolicitationOfNonGovtGrantsInd>
      <SolicitationOfGovtGrantsInd>X</SolicitationOfGovtGrantsInd>
      <SpecialFundraisingEventsInd>X</SpecialFundraisingEventsInd>
      <AgrmtProfFundraisingActyInd>1</AgrmtProfFundraisingActyInd>
      <FundraiserActivityInfoGrp>
        <OrganizationBusinessName>
          <BusinessNameLine1Txt>TAYLORMADE EXPERIENCE</BusinessNameLine1Txt>
        </OrganizationBusinessName>
        <USAddress>
          <AddressLine1Txt>9007 OAK PLACE</AddressLine1Txt>
          <CityNm>BETHESDA</CityNm>
          <StateAbbreviationCd>MD</StateAbbreviationCd>
          <ZIPCd>20817</ZIPCd>
        </USAddress>
        <ActivityTxt>VIRTUAL GALA</ActivityTxt>
        <FundraiserControlOfFundsInd>0</FundraiserControlOfFundsInd>
        <GrossReceiptsAmt>462693</GrossReceiptsAmt>
        <RetainedByContractorAmt>25314</RetainedByContractorAmt>
        <NetToOrganizationAmt>437379</NetToOrganizationAmt>
      </FundraiserActivityInfoGrp>
      <FundraiserActivityInfoGrp>
        <PersonNm>MAGGIE COHN COMMUNICATIONS</PersonNm>
        <USAddress>
          <AddressLine1Txt>84 FAWN BROOK CIRCLE</AddressLine1Txt>
          <CityNm>MADISON</CityNm>
          <StateAbbreviationCd>CT</StateAbbreviationCd>
          <ZIPCd>06443</ZIPCd>
        </USAddress>
        <ActivityTxt>APPEALS, LETTERS, AND NEWSLETTERS</ActivityTxt>
        <FundraiserControlOfFundsInd>0</FundraiserControlOfFundsInd>
        <GrossReceiptsAmt>121468</GrossReceiptsAmt>
        <RetainedByContractorAmt>16000</RetainedByContractorAmt>
        <NetToOrganizationAmt>105468</NetToOrganizationAmt>
      </FundraiserActivityInfoGrp>
      <TotalGrossReceiptsAmt>584161</TotalGrossReceiptsAmt>
      <TotalRetainedByContractorsAmt>41314</TotalRetainedByContractorsAmt>
      <TotalNetToOrganizationAmt>542847</TotalNetToOrganizationAmt>
      <LicensedStatesCd>MA</LicensedStatesCd>
      <LicensedStatesCd>CA</LicensedStatesCd>
    </IRS990ScheduleG>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>0</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>0</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JULIA BRODY</PersonNm>
        <TitleTxt>EXECUTIVE DIRECTOR/SENIOR</TitleTxt>
        <BaseCompensationFilingOrgAmt>179878</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>10100</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>11500</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>201478</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>A COPY OF FORM 990 IS DISTRIBUTED TO ALL BOARD MEMBERS FOR REVIEW AND APPROVAL BEFORE FORM 990 IS FILED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>SILENT SPRING INSTITUTE ANNUALLY DISTRIBUTES A CONFLICT OF INTEREST QUESTIONAIRE TO BE COMPLETED AND RETURNED BY ALL KEY EMPLOYEES AND BOARD OF DIRECTOR MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE DIRECTOR'S SALARY IS REVIEWED AND APPROVED ANNUALLY BY THE BOARD OF DIRECTORS AT AN EXECUTIVE SESSION MEETING. SALARIES OF EXECUTIVE DIRECTORS AT COMPARABLE AGENCIES ARE USED TO DETERMINE THE EXECUTIVE DIRECTOR'S SALARY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>GOVERNING DOCUMENTS, POLICIES AND STATEMENTS ARE AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>SUBCONTRACTED SERVICES: PROGRAM SERVICE EXPENSES 738,900. MANAGEMENT AND GENERAL EXPENSES 1,639. FUNDRAISING EXPENSES 11,099. TOTAL EXPENSES 751,638. CONTRACTED SERVICES: PROGRAM SERVICE EXPENSES 16,914. MANAGEMENT AND GENERAL EXPENSES 11,628. FUNDRAISING EXPENSES 6,610. TOTAL EXPENSES 35,152.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
