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        <TypeOfActivitiesConductedTxt>Grants to recipients</TypeOfActivitiesConductedTxt>
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      <TotalSpentAmt>419772</TotalSpentAmt>
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        <PurposeOfGrantTxt>Scientific Research</PurposeOfGrantTxt>
        <CashGrantAmt>127652</CashGrantAmt>
        <MannerOfCashDisbursementTxt>Wire Trans.</MannerOfCashDisbursementTxt>
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        <RegionTxt>Canada</RegionTxt>
        <PurposeOfGrantTxt>Scientific Research</PurposeOfGrantTxt>
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      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>Sweden</RegionTxt>
        <PurposeOfGrantTxt>Scientific Research</PurposeOfGrantTxt>
        <CashGrantAmt>75000</CashGrantAmt>
        <MannerOfCashDisbursementTxt>Wire Trans.</MannerOfCashDisbursementTxt>
      </GrantsToOrgOutsideUSGrp>
      <GrantsToOrgOutsideUSGrp>
        <RegionTxt>United Kindom</RegionTxt>
        <PurposeOfGrantTxt>Scientific Research</PurposeOfGrantTxt>
        <CashGrantAmt>67120</CashGrantAmt>
        <MannerOfCashDisbursementTxt>Wire Trans.</MannerOfCashDisbursementTxt>
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      <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>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>
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      <AgrmtProfFundraisingActyInd>true</AgrmtProfFundraisingActyInd>
      <FundraiserActivityInfoGrp>
        <OrganizationBusinessName>
          <BusinessNameLine1Txt>Susan Quinlan Martin</BusinessNameLine1Txt>
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          <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>82760</GrossReceiptsAmt>
        <RetainedByContractorAmt>68000</RetainedByContractorAmt>
        <NetToOrganizationAmt>14760</NetToOrganizationAmt>
      </FundraiserActivityInfoGrp>
      <TotalGrossReceiptsAmt>82760</TotalGrossReceiptsAmt>
      <TotalRetainedByContractorsAmt>68000</TotalRetainedByContractorsAmt>
      <TotalNetToOrganizationAmt>14760</TotalNetToOrganizationAmt>
      <LicensedStatesCd>NY</LicensedStatesCd>
      <LicensedStatesCd>CA</LicensedStatesCd>
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        <Event1Nm>FR events</Event1Nm>
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        <GrossReceiptsTotalAmt>82760</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>82760</CharitableContributionsTotAmt>
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          <BusinessNameLine1Txt>California Institute of Tech</BusinessNameLine1Txt>
        </RecipientBusinessName>
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          <AddressLine1Txt>1200 E California Blvd</AddressLine1Txt>
          <CityNm>Pasadena</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>91125</ZIPCd>
        </USAddress>
        <RecipientEIN>951643307</RecipientEIN>
        <CashGrantAmt>75000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
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      <RecipientTable>
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          <BusinessNameLine1Txt>Columbia University Med Ctr</BusinessNameLine1Txt>
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          <AddressLine1Txt>1790 Broadway</AddressLine1Txt>
          <CityNm>New York</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
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          <BusinessNameLine1Txt>Ludwig Inst for Cancer Resea</BusinessNameLine1Txt>
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          <AddressLine1Txt>666 3rd Ave</AddressLine1Txt>
          <CityNm>New York</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10017</ZIPCd>
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        <RecipientEIN>237121131</RecipientEIN>
        <CashGrantAmt>129056</CashGrantAmt>
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          <BusinessNameLine1Txt>Mass Institute of Technology</BusinessNameLine1Txt>
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          <AddressLine1Txt>77 Massachusetts Avenue</AddressLine1Txt>
          <CityNm>Cambridge</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02139</ZIPCd>
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        <RecipientEIN>042103594</RecipientEIN>
        <CashGrantAmt>75000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Massachusetts General Hosp</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>55 Fruit Street</AddressLine1Txt>
          <CityNm>Boston</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02114</ZIPCd>
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        <RecipientEIN>042697983</RecipientEIN>
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          <BusinessNameLine1Txt>New York Genome Center Inc</BusinessNameLine1Txt>
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          <AddressLine1Txt>101 6th Ave</AddressLine1Txt>
          <CityNm>New York</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10013</ZIPCd>
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        <RecipientEIN>800631734</RecipientEIN>
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        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>The Trustees Of Columbia Uni</BusinessNameLine1Txt>
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          <AddressLine1Txt>535 W 116th St</AddressLine1Txt>
          <CityNm>New York</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10027</ZIPCd>
        </USAddress>
        <RecipientEIN>135598093</RecipientEIN>
        <CashGrantAmt>150000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
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          <BusinessNameLine1Txt>Univ of California Irvine</BusinessNameLine1Txt>
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          <AddressLine1Txt>260 Aldrich Hall</AddressLine1Txt>
          <CityNm>Irvine</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
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          <BusinessNameLine1Txt>University Mass Medical Sch</BusinessNameLine1Txt>
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          <CityNm>Worcester</CityNm>
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          <BusinessNameLine1Txt>University of Califonria</BusinessNameLine1Txt>
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          <CityNm>Oakland</CityNm>
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          <AddressLine1Txt>500 Joseph C Wilson Blvd</AddressLine1Txt>
          <CityNm>Rochester</CityNm>
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          <BusinessNameLine1Txt>UT Southwestern MedicalCenter</BusinessNameLine1Txt>
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          <AddressLine1Txt>5323 Harry Hines Blvd</AddressLine1Txt>
          <CityNm>Dallas</CityNm>
          <StateAbbreviationCd>TX</StateAbbreviationCd>
          <ZIPCd>75390</ZIPCd>
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        <RecipientEIN>756002868</RecipientEIN>
        <CashGrantAmt>137036</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
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      <RecipientTable>
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          <BusinessNameLine1Txt>Whitehead Institute</BusinessNameLine1Txt>
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          <AddressLine1Txt>455 Main St</AddressLine1Txt>
          <CityNm>Cambridge</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02142</ZIPCd>
        </USAddress>
        <RecipientEIN>061043412</RecipientEIN>
        <CashGrantAmt>75000</CashGrantAmt>
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        <GrantTypeTxt>Scientific Research - Gehry Prize</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
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        <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>
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        <PersonNm>David Housman</PersonNm>
        <RelationshipWithOrgTxt>Board Member</RelationshipWithOrgTxt>
        <CashGrantAmt>75000</CashGrantAmt>
        <TypeOfAssistanceTxt>Research Grant</TypeOfAssistanceTxt>
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      <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>
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      <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>
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      <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>
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</Return>
