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            <CityNm>SEATTLE</CityNm>
            <StateAbbreviationCd>WA</StateAbbreviationCd>
            <ZIPCd>98101</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>HOTEL ROOM AND CATERING</ServicesDesc>
        <CompensationAmt>305899</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>CHICAGO HILTON TOWER</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>720 S MICHIGAN AVE</AddressLine1Txt>
            <CityNm>CHICAGO</CityNm>
            <StateAbbreviationCd>IL</StateAbbreviationCd>
            <ZIPCd>60605</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>HOTEL ROOM AND CATERING</ServicesDesc>
        <CompensationAmt>222265</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>LEWIS-BURKE ASSOCIATES LLC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>440 1ST STREET NW 700</AddressLine1Txt>
            <CityNm>WASHINGTON</CityNm>
            <StateAbbreviationCd>DC</StateAbbreviationCd>
            <ZIPCd>20001</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>GOVERNMENT RELATIONS SERVICES</ServicesDesc>
        <CompensationAmt>136000</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>PRESTIGE ACCOMMODATIONS INTERNATIONAL</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1231 E DYER RD 240</AddressLine1Txt>
            <CityNm>SANTA ANA</CityNm>
            <StateAbbreviationCd>CA</StateAbbreviationCd>
            <ZIPCd>92705</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>MEETING PLANNING VENDOR</ServicesDesc>
        <CompensationAmt>106840</CompensationAmt>
      </ContractorCompensationGrp>
      <CntrctRcvdGreaterThan100KCnt>5</CntrctRcvdGreaterThan100KCnt>
      <ProgramServiceRevenueGrp>
        <Desc>MEETINGS AND CONFERENC</Desc>
        <BusinessCd>541900</BusinessCd>
        <TotalRevenueColumnAmt>1368313</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1368313</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>MEMBERSHIP DUES</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>582942</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>582942</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>PUBLICATIONS</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>406229</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>406229</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>TECHNICAL GROUP</Desc>
        <BusinessCd>511190</BusinessCd>
        <TotalRevenueColumnAmt>37551</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>37551</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>CAREER CENTER</Desc>
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        <UnrelatedBusinessRevenueAmt>23596</UnrelatedBusinessRevenueAmt>
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      <TotalOthProgramServiceRevGrp>
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        <ExclusionAmt>10314</ExclusionAmt>
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        <ExclusionAmt>14717</ExclusionAmt>
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        <Desc>OTHER REVENUE</Desc>
        <BusinessCd>900099</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>3437</RelatedOrExemptFuncIncomeAmt>
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      <OtherRevenueTotalAmt>3437</OtherRevenueTotalAmt>
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        <ProgramServicesAmt>22860</ProgramServicesAmt>
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      <GrantsToDomesticIndividualsGrp>
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        <ProgramServicesAmt>37002</ProgramServicesAmt>
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        <ProgramServicesAmt>13946</ProgramServicesAmt>
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      <FeesForServicesManagementGrp>
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        <ProgramServicesAmt>383125</ProgramServicesAmt>
        <ManagementAndGeneralAmt>248360</ManagementAndGeneralAmt>
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      <FeesForServicesLegalGrp>
        <TotalAmt>753</TotalAmt>
        <ManagementAndGeneralAmt>753</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>10689</TotalAmt>
        <ManagementAndGeneralAmt>10689</ManagementAndGeneralAmt>
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      <FeesForSrvcInvstMgmntFeesGrp>
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        <ManagementAndGeneralAmt>165</ManagementAndGeneralAmt>
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      <FeesForServicesOtherGrp>
        <TotalAmt>241178</TotalAmt>
        <ProgramServicesAmt>45211</ProgramServicesAmt>
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      <OfficeExpensesGrp>
        <TotalAmt>21860</TotalAmt>
        <ProgramServicesAmt>5968</ProgramServicesAmt>
        <ManagementAndGeneralAmt>15892</ManagementAndGeneralAmt>
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      <InformationTechnologyGrp>
        <TotalAmt>7266</TotalAmt>
        <ManagementAndGeneralAmt>7266</ManagementAndGeneralAmt>
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      <TravelGrp>
        <TotalAmt>67321</TotalAmt>
        <ProgramServicesAmt>49134</ProgramServicesAmt>
        <ManagementAndGeneralAmt>18187</ManagementAndGeneralAmt>
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      <ConferencesMeetingsGrp>
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        <ProgramServicesAmt>695129</ProgramServicesAmt>
        <ManagementAndGeneralAmt>41091</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>3403</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5363</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>MISCELLANEOUS</Desc>
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        <ProgramServicesAmt>20398</ProgramServicesAmt>
        <ManagementAndGeneralAmt>44610</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>DUES AND SUBSCRIPTIONS</Desc>
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        <ProgramServicesAmt>26845</ProgramServicesAmt>
        <ManagementAndGeneralAmt>20359</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>TECHNICAL GROUP</Desc>
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        <ProgramServicesAmt>34607</ProgramServicesAmt>
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      <AllOtherExpensesGrp>
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        <EOYAmt>955351</EOYAmt>
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        <EOYAmt>128282</EOYAmt>
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      <TotalNetAssetsFundBalanceGrp>
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      <TotLiabNetAssetsFundBalanceGrp>
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        <EOYAmt>1725695</EOYAmt>
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      <FSAuditedBasisGrp>
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        <CurrentTaxYearMinus1YearAmt>2183687</CurrentTaxYearMinus1YearAmt>
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        <CurrentTaxYearMinus2YearsAmt>2175243</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>2183687</CurrentTaxYearMinus1YearAmt>
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      <SubstAndDsqlfyPrsnsTotGrp>
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      <GrossInvestmentIncome509Grp>
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      <PaidStaffOrManagementInd>1</PaidStaffOrManagementInd>
      <MediaAdvertisementsInd>0</MediaAdvertisementsInd>
      <MailingsMembersInd>0</MailingsMembersInd>
      <PublicationsOrBroadcastInd>0</PublicationsOrBroadcastInd>
      <GrantsOtherOrganizationsInd>0</GrantsOtherOrganizationsInd>
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      <NotDescribedSection501c3Ind>0</NotDescribedSection501c3Ind>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>TYPE OF ACTIVITY:</FormAndLineReferenceDesc>
        <ExplanationTxt>HUMAN FACTORS AND ERGONOMICS SOCIETY ESTIMATES THAT $21,231 WAS PAID TO LEWIS-BURKE ASSOCIATES, WASHINGTON, DC, FOR LOBBYING, INCLUDING INFLUENCING LEGISTLATION, DIRECT CONTACT WITH MEMBERS OF CONGRESS AND THEIR STAFFS, AND COMMUNICATION WITH COVERED EXECUTIVE BRANCH OFFICIALS.</ExplanationTxt>
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      <FootnoteTextInd>X</FootnoteTextInd>
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        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ACCOUNTING STANDARD ON ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES ADDRESSES THE DETERMINATION OF WHETHER TAX BENEFITS CLAIMED OR EXPECTED TO BE CLAIMED ON A TAX RETURN SHOULD BE RECORDED IN THE FINANCIAL STATEMENTS. UNDER THAT GUIDANCE, HFES MAY RECOGNIZE THE TAX BENEFIT FROM AN UNCERTAIN TAX POSITION ONLY IF IT IS MORE LIKELY THAN NOT THAT THE TAX POSITION WILL BE SUSTAINED ON EXAMINATION BY TAXING AUTHORITIES BASED ON THE TECHNICAL MERITS OF THE POSITION. EXAMPLES OF TAX POSITIONS INCLUDE THE TAX-EXEMPT STATUS OF HFES AND VARIOUS POSITIONS RELATED TO THE POTENTIAL SOURCES OF UNRELATED BUSINESS INCOME TAX (UBIT). THE TAX BENEFITS RECOGNIZED IN THE FINANCIAL STATEMENTS FROM SUCH AN UNCERTAIN TAX POSITION ARE MEASURED BASED ON THE LARGEST BENEFIT THAT HAS A GREATER THAN 50% LIKELIHOOD OF BEING REALIZED UPON ULTIMATE SETTLEMENT. THERE WERE NO UNRECOGNIZED TAX BENEFITS RELATED TO UNCERTAIN TAX POSITIONS IDENTIFIED OR RECORDED AS LIABILITIES FOR THE YEAR ENDED DECEMBER 31, 2019. HFES'S POLICY WOULD BE TO RECOGNIZE INTEREST AND PENALTIES, IF ANY, ON TAX POSITIONS RELATED TO ITS UNRECOGNIZED TAX BENEFITS IN INCOME TAX EXPENSE IN THE FINANCIAL STATEMENTS. NO INTEREST AND PENALTIES WERE ASSESSED OR RECORDED DURING THE YEAR ENDED DECEMBER 31, 2019.</ExplanationTxt>
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      <ForeignIndividualsGrantsGrp>
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      <ForeignIndividualsGrantsGrp>
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        <RegionTxt>AUSTRALIA</RegionTxt>
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      <ForeignIndividualsGrantsGrp>
        <TypeOfAssistanceTxt>AWARD</TypeOfAssistanceTxt>
        <RegionTxt>CHINA</RegionTxt>
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      <ForeignIndividualsGrantsGrp>
        <TypeOfAssistanceTxt>AWARD</TypeOfAssistanceTxt>
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      <InterestInForeignTrustInd>0</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>0</ForeignCorpOwnershipInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III ACCOUNTING METHOD:</FormAndLineReferenceDesc>
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        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>6100 MAIN STREET</AddressLine1Txt>
          <CityNm>HOUSTON</CityNm>
          <StateAbbreviationCd>TX</StateAbbreviationCd>
          <ZIPCd>77005</ZIPCd>
        </USAddress>
        <RecipientEIN>741109620</RecipientEIN>
        <CashGrantAmt>22860</CashGrantAmt>
        <PurposeOfGrantTxt>EDITORIAL ASSISTANCE.</PurposeOfGrantTxt>
      </RecipientTable>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>AWARDS</GrantTypeTxt>
        <RecipientCnt>49</RecipientCnt>
        <CashGrantAmt>37002</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
    </IRS990ScheduleI>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>HFES HAS CONTRACTED SMITHBUCKLIN TO PERFORM MANAGEMENT FUNCTIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS. HFES IS A 501(C)(3) NON-PROFIT WHOSE COUNCIL MEMBERS ARE MEMBERS/VOLUNTEERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MEMBERS OF THE SOCIETY ARE EMPOWERED IN THE BYLAWS TO ELECT MEMBERS OF THE GOVERNING BODY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>990 IS REVIEWED BY MANAGEMENT AND THEN PROVIDED TO EXECUTIVE COUNCIL AND FINANCE COMMITTEE PRIOR TO FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>HFES MAKES GOVERNING DOCUMENTS AVAILABLE ONLINE BY ACCESSING HFES'S WEBSITE. HFES ALSO MAKES ITS FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST IN HFES'S OFFICES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>BANK AND CREDIT CARD CHARGES: PROGRAM SERVICE EXPENSES 0. MANAGEMENT AND GENERAL EXPENSES 54,423. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 54,423. CONSULTANTS: PROGRAM SERVICE EXPENSES 41,445. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 41,445. MARKETING: PROGRAM SERVICE EXPENSES 3,766. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 3,766. GOVERNMENT RELATIONS: PROGRAM SERVICE EXPENSES 0. MANAGEMENT AND GENERAL EXPENSES 141,544. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 141,544.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>HFES DID NOT CHANGE EITHER ITS OVERSIGHT PROCESS OR SELECTION PROCESS DURING THE TAX YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>