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      <ContinuationSpentAmt>0</ContinuationSpentAmt>
      <TotalSpentAmt>571312</TotalSpentAmt>
      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>CANADA</RegionTxt>
        <PurposeOfGrantTxt>SCIENTIFIC RESEARCH</PurposeOfGrantTxt>
        <CashGrantAmt>196512</CashGrantAmt>
        <MannerOfCashDisbursementTxt>WIRE TRANS.</MannerOfCashDisbursementTxt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
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      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>SWEDEN</RegionTxt>
        <PurposeOfGrantTxt>SCIENTIFIC RESEARCH</PurposeOfGrantTxt>
        <CashGrantAmt>150000</CashGrantAmt>
        <MannerOfCashDisbursementTxt>WIRE TRANS.</MannerOfCashDisbursementTxt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
      </GrantsToOrgOutsideUSGrp>
      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>CANADA</RegionTxt>
        <PurposeOfGrantTxt>SCIENTIFIC RESEARCH</PurposeOfGrantTxt>
        <CashGrantAmt>74800</CashGrantAmt>
        <MannerOfCashDisbursementTxt>WIRE TRANS.</MannerOfCashDisbursementTxt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
      </GrantsToOrgOutsideUSGrp>
      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>FRANCE</RegionTxt>
        <PurposeOfGrantTxt>SCIENTIFIC RESEARCH</PurposeOfGrantTxt>
        <CashGrantAmt>75000</CashGrantAmt>
        <MannerOfCashDisbursementTxt>WIRE TRANS.</MannerOfCashDisbursementTxt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
      </GrantsToOrgOutsideUSGrp>
      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>ITALY</RegionTxt>
        <PurposeOfGrantTxt>SCIENTIFIC RESEARCH</PurposeOfGrantTxt>
        <CashGrantAmt>75000</CashGrantAmt>
        <MannerOfCashDisbursementTxt>WIRE TRANS.</MannerOfCashDisbursementTxt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
      </GrantsToOrgOutsideUSGrp>
      <Total501c3OrgCnt>5</Total501c3OrgCnt>
      <TransferToForeignCorpInd>0</TransferToForeignCorpInd>
      <InterestInForeignTrustInd>0</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>0</ForeignCorpOwnershipInd>
      <PassiveForeignInvestmestCoInd>0</PassiveForeignInvestmestCoInd>
      <ForeignPartnershipInd>0</ForeignPartnershipInd>
      <BoycottCountriesInd>0</BoycottCountriesInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>HDF MONITORS ITS GRANTS BY REQUIRING SCIENCE RESEARCH PROGRESS REPORTS FROM GRANTEES AS A CONDITION TO FURTHER PAYMENTS OF ANY GRANT PAYABLE IN INSTALLMENTS, AND A FINAL REPORT ON COMPLETION OF THE RESEARCH</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III ACCOUNTING METHOD:</FormAndLineReferenceDesc>
      </SupplementalInformationDetail>
    </IRS990ScheduleF>
    <IRS990ScheduleG documentId="RetDoc1041200001">
      <InPersonSolicitationsInd>X</InPersonSolicitationsInd>
      <SolicitationOfNonGovtGrantsInd>X</SolicitationOfNonGovtGrantsInd>
      <SpecialFundraisingEventsInd>X</SpecialFundraisingEventsInd>
      <AgrmtProfFundraisingActyInd>0</AgrmtProfFundraisingActyInd>
      <FundraiserActivityInfoGrp>
        <OrganizationBusinessName>
          <BusinessNameLine1Txt>SUSAN QUINLAN MARTIN INC</BusinessNameLine1Txt>
        </OrganizationBusinessName>
        <USAddress>
          <AddressLine1Txt>10 MITCHELL PLACE STE 3 H</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10017</ZIPCd>
        </USAddress>
        <ActivityTxt>EVENT PLANNER 2022 GALA</ActivityTxt>
        <FundraiserControlOfFundsInd>0</FundraiserControlOfFundsInd>
        <GrossReceiptsAmt>442583</GrossReceiptsAmt>
        <RetainedByContractorAmt>113000</RetainedByContractorAmt>
        <NetToOrganizationAmt>329583</NetToOrganizationAmt>
      </FundraiserActivityInfoGrp>
      <TotalGrossReceiptsAmt>442583</TotalGrossReceiptsAmt>
      <TotalRetainedByContractorsAmt>113000</TotalRetainedByContractorsAmt>
      <TotalNetToOrganizationAmt>329583</TotalNetToOrganizationAmt>
      <LicensedStatesCd>CA</LicensedStatesCd>
      <LicensedStatesCd>NY</LicensedStatesCd>
      <FundraisingEventInformationGrp>
        <Event1Nm>GALA</Event1Nm>
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        <CharitableContriEvent1Amt>297582</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>145001</GrossRevenueEvent1Amt>
        <OtherDirectExpensesEvent1Amt>145001</OtherDirectExpensesEvent1Amt>
        <GrossReceiptsTotalAmt>442583</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>297582</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>145001</GrossRevenueTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>145001</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>145001</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>0</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>J DAVID GLADSTONE INSTITUTES</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1650 OWENS STREET</AddressLine1Txt>
          <CityNm>SAN FRANCISCO</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>94158</ZIPCd>
        </USAddress>
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        <PurposeOfGrantTxt>SCIENTIFIC RESEARCH</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>MASSACHUSETTS INSTITUTE OF TECHNOLOGY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>77 MASSACHUSETTS AVENUE NE18-901</AddressLine1Txt>
          <CityNm>CAMBRIDGE</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>021394307</ZIPCd>
        </USAddress>
        <RecipientEIN>042103594</RecipientEIN>
        <IRCSectionDesc>501 C (3)</IRCSectionDesc>
        <CashGrantAmt>185828</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>SCIENTIFIC RESEARCH</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>STANFORD UNIVERSITY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>450 JANE STANFORD WAY</AddressLine1Txt>
          <CityNm>STANFORD</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>943052004</ZIPCd>
        </USAddress>
        <RecipientEIN>941156365</RecipientEIN>
        <IRCSectionDesc>501 C (3)</IRCSectionDesc>
        <CashGrantAmt>177837</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>SCIENTIFIC RESEARCH</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>THE BOARD OF TRUSTEES OF THE LELAND STANFORD</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>485 BROADWAY</AddressLine1Txt>
          <CityNm>REDWOOD CITY</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>94063</ZIPCd>
        </USAddress>
        <RecipientEIN>941156365</RecipientEIN>
        <IRCSectionDesc>501 C (3)</IRCSectionDesc>
        <CashGrantAmt>135320</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>SCIENTIFIC RESEARCH</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>UNIVERSITY OF MASSACHUSETTS MED SCHOOL DE</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>55 LAKE AVENUE NORTH</AddressLine1Txt>
          <CityNm>WORCESTER</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>01655</ZIPCd>
        </USAddress>
        <RecipientEIN>043167352</RecipientEIN>
        <IRCSectionDesc>501 C (3)</IRCSectionDesc>
        <CashGrantAmt>130064</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>SCIENTIFIC RESEARCH</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>5</Total501c3OrgCnt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>HDF MONITORS ITS GRANTS BY REQUIRING SCIENCE RESEARCH PROGRESS REPORTS FROM GRANTEES AS A CONDITION TO FURTHER PAYMENTS OF ANY GRANT PAYABLE IN INSTALLMENTS, AND A FINAL REPORT ON COMPLETION OF THE RESEARCH.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>NANCY WEXLER, PRESIDENT, AND ALICE WEXLER, SECRETARY, ARE SISTERS AND BOTH ARE MEMBERS OF THE BOARD OF DIRECTORS. MEGHAN DONALDSON, CEO, AND BRUCE DONALDSON, BOARD MEMBER, ARE MARRIED AND ARE BOTH MEMBERS OF THE BOARD OF DIRECTORS. KELLY POSNER GERSTENHABER AND DAVID GERSTENHABER ARE MARRIED AND BOTH ARE MEMBERS OF THE BOARD OF DIRECTORS. FRANK GEHRY AND BERTA GEHRY ARE MARRIED AND BOTH ARE MEMBERS OF THE BOARD OF DIRECTORS. SANDY FOX IS THE AUNT OF DAVID ZWALLY AND BOTH ARE MEMBERS OF THE BOARD OF DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FOUNDATION PROVIDES THE 990 TO THE BOARD OF DIRECTORS FOR APPROVAL.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUAL CONFLICT OF INTEREST STATEMENTS ARE CIRCULATED TO ALL OFFICERS, DIRECTORS, AND KEY EMPLOYEES AT THE BOARD OF DIRECTORS MEETING. MANAGEMENT MAINTAINS SIGNED COPIES OF THESE STATEMENTS FOR ALL SUCH INDIVIDUALS TO ENSURE COMPLIANCE WITH THIS POLICY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>A WRITTEN EMPLOYEE CONTRACT IS ESTABLISHED AND APPROVED BY THE BOARD OR COMPENSATION COMMITTEE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FOUNDATION MAKES ITS FINANCIAL STATEMENTS AND 990 AVAILABLE TO THE PUBLIC ON ITS WEBSITE, WWW.HDFOUNDATION.ORG. THE FOUNDATION MAKES ITS GOVERING DOCUMENTS AND CONFLICTS OF INTEREST POLICY AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>CONSULTANTS: PROGRAM SERVICE EXPENSES 202,034. MANAGEMENT AND GENERAL EXPENSES 42,542. FUNDRAISING EXPENSES 151,514. TOTAL EXPENSES 396,090.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
