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        <FormAndLineReferenceDesc>Part X : FIN48 Footnote</FormAndLineReferenceDesc>
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        <RegionTotalExpendituresAmt>91718</RegionTotalExpendituresAmt>
      </AccountActivitiesOutsideUSGrp>
      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>Germany</RegionTxt>
        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>Grants to recipients</TypeOfActivitiesConductedTxt>
        <SpecificServicesProvidedTxt>Scientific Research</SpecificServicesProvidedTxt>
        <RegionTotalExpendituresAmt>150000</RegionTotalExpendituresAmt>
      </AccountActivitiesOutsideUSGrp>
      <SubtotalEmployeesCnt>1</SubtotalEmployeesCnt>
      <TotalEmployeeCnt>1</TotalEmployeeCnt>
      <SubtotalSpentAmt>241718</SubtotalSpentAmt>
      <TotalSpentAmt>241718</TotalSpentAmt>
      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>Germany</RegionTxt>
        <PurposeOfGrantTxt>Scientific Research</PurposeOfGrantTxt>
        <CashGrantAmt>150000</CashGrantAmt>
        <MannerOfCashDisbursementTxt>Wire Trans.</MannerOfCashDisbursementTxt>
      </GrantsToOrgOutsideUSGrp>
      <TotalOtherOrgCnt>1</TotalOtherOrgCnt>
      <ForeignIndividualsGrantsGrp>
        <TypeOfAssistanceTxt>Grant to assist in clinic operation</TypeOfAssistanceTxt>
        <RegionTxt>Venezuela</RegionTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>91718</CashGrantAmt>
        <MannerOfCashDisbursementTxt>Check</MannerOfCashDisbursementTxt>
      </ForeignIndividualsGrantsGrp>
      <TransferToForeignCorpInd>false</TransferToForeignCorpInd>
      <InterestInForeignTrustInd>false</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>false</ForeignCorpOwnershipInd>
      <PassiveForeignInvestmestCoInd>false</PassiveForeignInvestmestCoInd>
      <ForeignPartnershipInd>false</ForeignPartnershipInd>
      <BoycottCountriesInd>false</BoycottCountriesInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 2 - Grantmakers Explanation For Monitoring Use of Funds Outside US</FormAndLineReferenceDesc>
        <ExplanationTxt>Expenses incurred outside of the United States are monitored through the submission of invoices to the central office located in New York as well as the President's consistent contact with the program director regarding program activities.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleF>
    <IRS990ScheduleG documentId="IRS990ScheduleG" softwareId="18007218" softwareVersionNum="2018v3.1">
      <InPersonSolicitationsInd>X</InPersonSolicitationsInd>
      <SolicitationOfNonGovtGrantsInd>X</SolicitationOfNonGovtGrantsInd>
      <SpecialFundraisingEventsInd>X</SpecialFundraisingEventsInd>
      <AgrmtProfFundraisingActyInd>false</AgrmtProfFundraisingActyInd>
      <FundraiserActivityInfoGrp>
        <OrganizationBusinessName>
          <BusinessNameLine1Txt>Susan Quinlan Martin</BusinessNameLine1Txt>
        </OrganizationBusinessName>
        <USAddress>
          <AddressLine1Txt>350 East 55th Street</AddressLine1Txt>
          <CityNm>New York</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10022</ZIPCd>
        </USAddress>
        <ActivityTxt>Event Consultant</ActivityTxt>
        <FundraiserControlOfFundsInd>false</FundraiserControlOfFundsInd>
        <GrossReceiptsAmt>626532</GrossReceiptsAmt>
        <RetainedByContractorAmt>68000</RetainedByContractorAmt>
        <NetToOrganizationAmt>558532</NetToOrganizationAmt>
      </FundraiserActivityInfoGrp>
      <TotalGrossReceiptsAmt>626532</TotalGrossReceiptsAmt>
      <TotalRetainedByContractorsAmt>68000</TotalRetainedByContractorsAmt>
      <TotalNetToOrganizationAmt>558532</TotalNetToOrganizationAmt>
      <LicensedStatesCd>NY</LicensedStatesCd>
      <LicensedStatesCd>CA</LicensedStatesCd>
      <FundraisingEventInformationGrp>
        <Event1Nm>FR events</Event1Nm>
        <GrossReceiptsEvent1Amt>626532</GrossReceiptsEvent1Amt>
        <CharitableContriEvent1Amt>563779</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>62753</GrossRevenueEvent1Amt>
        <RentFacilityCostsEvent1Amt>53960</RentFacilityCostsEvent1Amt>
        <EntertainmentEvent1Amt>8793</EntertainmentEvent1Amt>
        <GrossReceiptsTotalAmt>626532</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>563779</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>62753</GrossRevenueTotalEventsAmt>
        <RentFcltyCostsTotalEventsAmt>53960</RentFcltyCostsTotalEventsAmt>
        <EntertainmentTotalEventsAmt>8793</EntertainmentTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>62753</DirectExpenseSummaryEventsAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleI documentId="IRS990ScheduleI" softwareId="18007218" softwareVersionNum="2018v3.1">
      <GrantRecordsMaintainedInd>true</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Mass Institute of Technology</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>77 Massachusetts Avenue</AddressLine1Txt>
          <CityNm>Cambridge</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02139</ZIPCd>
        </USAddress>
        <RecipientEIN>042103594</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>110924</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Massachusetts General Hosp</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>55 Fruit Street</AddressLine1Txt>
          <CityNm>Boston</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02114</ZIPCd>
        </USAddress>
        <RecipientEIN>042697983</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>75000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Medical College of Wisconsin</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>8701 W Watertown Plank Rd</AddressLine1Txt>
          <CityNm>Wauwatosa</CityNm>
          <StateAbbreviationCd>WI</StateAbbreviationCd>
          <ZIPCd>53226</ZIPCd>
        </USAddress>
        <RecipientEIN>390806261</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>75000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Stanford University</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>450 Serra Mall</AddressLine1Txt>
          <CityNm>Stanford</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>94305</ZIPCd>
        </USAddress>
        <RecipientEIN>941156365</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>150000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Thomas Jefferson University</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>4201 Henry Avenue</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19144</ZIPCd>
        </USAddress>
        <RecipientEIN>231352651</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>75000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Univ of California Irvine</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>260 Aldrich Hall</AddressLine1Txt>
          <CityNm>Irvine</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>92697</ZIPCd>
        </USAddress>
        <RecipientEIN>952226406</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>75000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>University of Pennsylvania</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>3451 Walnut Street</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19104</ZIPCd>
        </USAddress>
        <RecipientEIN>231352685</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>75000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
      </RecipientTable>
      <Total501c3OrgCnt>7</Total501c3OrgCnt>
      <TotalOtherOrgCnt>0</TotalOtherOrgCnt>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>Scientific Research</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>100000</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Grantmaker's Description of How Grants are Used</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>
    <IRS990ScheduleL documentId="IRS990ScheduleL" softwareId="18007218" softwareVersionNum="2018v3.1">
      <GrntAsstBnftInterestedPrsnGrp>
        <PersonNm>David Housman</PersonNm>
        <RelationshipWithOrgTxt>Board Member</RelationshipWithOrgTxt>
        <CashGrantAmt>107000</CashGrantAmt>
        <TypeOfAssistanceTxt>Research Grant</TypeOfAssistanceTxt>
      </GrntAsstBnftInterestedPrsnGrp>
      <GrntAsstBnftInterestedPrsnGrp>
        <PersonNm>Ellen Penney</PersonNm>
        <RelationshipWithOrgTxt>Daughter of Board Member</RelationshipWithOrgTxt>
        <CashGrantAmt>75000</CashGrantAmt>
        <TypeOfAssistanceTxt>Research Grant</TypeOfAssistanceTxt>
      </GrntAsstBnftInterestedPrsnGrp>
    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="18007218" softwareVersionNum="2018v3.1">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 2: Description of Business or Family Relationship of Officers, Directors, Et</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, Line 11b: Form 990 Review Process</FormAndLineReferenceDesc>
        <ExplanationTxt>The Foundation provides the 990 to the board of directors for approval.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c: Explanation of Monitoring and Enforcement of Conflicts</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, Line 15a: Compensation Review &amp; Approval Process - CEO, Top Management</FormAndLineReferenceDesc>
        <ExplanationTxt>A written employee contract is established and approved by the board or compensation committee.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19: Other Organization Documents Publicly Available</FormAndLineReferenceDesc>
        <ExplanationTxt>The Foundation makes its financial statements and 990 available to the public on its website, www.hdfoundation.org. The Foundation makes its governing documents and conflicts of interest policy available to the public upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>