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        <TitleTxt>(10/22-3/23) / VP, DEV. &amp; EX. REL.</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>SARA LEE KELLER</PersonNm>
        <TitleTxt>SEC. / GEN COUNSEL (THRU 09/2022)</TitleTxt>
        <BaseCompensationFilingOrgAmt>195569</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART II, LINES 5, 6 &amp; 8:</FormAndLineReferenceDesc>
        <ExplanationTxt>REBECCA BERNSTEIN IS A SECONDED EMPLOYEE THAT PROVIDES SERVICES TO GMTO AND IS COMPENSATED BY THE CARNEGIE INSTITUTION FOR SCIENCE, AN UNRELATED ORGANIZATION. GMTO REIMBURSES THE CARNEGIE INSTITUTION FOR SCIENCE FOR SALARY AND BENEFITS RELATED TO THE SERVICES PROVIDED TO GMTO. THE AMOUNTS INCLUDED IN PART VII AND SCHEDULE J, PART II REPRESENT REBECCA BERNSTEIN'S COMPENSATION IN CONNECTION WITH THE SERVICES PROVIDED TO GMTO.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>ORGANIZATION'S MEMBERS GMTO WAS FOUNDED AS A COLLABORATIVE EFFORT BETWEEN UNIVERSITIES AND RESEARCH ORGANIZATIONS TO BUILD THE GIANT MAGELLAN TELESCOPE ("GMT"). OVERSIGHT OF THE PROJECT IS CONDUCTED BY GMTO'S BOARD OF DIRECTORS WHICH CURRENTLY INCLUDES REPRESENTATIVES FROM THE FOUNDING INSTITUTIONS ("FOUNDERS"). A FOUNDER SHALL BE A MEMBER OF GMTO FOR AS LONG AS GMTO EXISTS, UNLESS THAT FOUNDER'S INTEREST IN GMTO IS TRANSFERRED, WITHDRAWN, OR TERMINATED IN ACCORDANCE WITH THE TERMS OF THE FOUNDERS' AGREMEENT OR BY OPERATION OF LAW.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FOUNDERS DICTATE WHO IS ON THE BOARD AND ANY VACANCY ON THE BOARD SHALL BE FILLED IN ACCORDANCE TO THE FOUNDERS' AGREEMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>THERE ARE CERTAIN GOVERNANCE DECISIONS RESERVED TO THE FOUNDERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>PROCESS USED TO REVIEW FORM 990 GMTO'S MANAGEMENT GATHERS THE INFORMATION REQUIRED TO COMPLETE THE FORM 990. THE FORM 990 IS PREPARED BY GRANT THORNTON'S TAX TEAM. A DRAFT OF THE FORM 990 IS REVIEWED BY THE GMTO PRESIDENT, CFO, AND GENERAL COUNSEL. ONCE APPROVED, THE DRAFT FORM IS EMAILED TO THE GMTO AUDIT COMMITTEE. ONCE APPROVED, THE FORM IS DISTRIBUTED TO THE VOTING BOARD OF DIRECTORS FOR REVIEW AND APPROVAL PRIOR TO FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>PROCESS USED TO MONITOR AND ENFORCE CONFLICT OF INTEREST POLICY ANNUALLY EACH BOARD MEMBER AND EMPLOYEE WHO IS IDENTIFIED AS AN "INSIDER" MUST COMPLETE A DOCUMENT IN WHICH THE MEMBER ATTESTS WHETHER ANY CONFLICTS OF INTEREST EXIST. IF THE BOARD DETERMINES THAT A CONFLICT OF INTEREST EXISTS, THE BOARD WILL TAKE REASONABLE STEPS TO ENSURE THE CONFLICT IS PROPERLY ADDRESSED, AND THE INTERESTS OF GMTO ARE PROTECTED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>PROCESS FOR DETERMINING COMPENSATION AN INDEPENDENT COMPENSATION FIRM IS ENGAGED TO VALIDATE PROPOSED COMPENSATION PACKAGES WHEN THE PRESIDENT, OFFICERS OR KEY EMPLOYEES ARE HIRED. THE PROPOSED COMPENSATION PACKAGE IS BASED UPON COMPARABILITY DATA. ADDITIONALLY, THE FINANCE COMMITTEE HAS THE RESPONSIBILITIES OF A COMPENSATION COMMITTEE TO APPROVE ALL HIGHER-LEVEL MANAGEMENT COMPENSATION PACKAGES AND MAKE RECOMMENDATIONS TO THE BOARD FOR APPROVAL. FOR ALL OTHER EMPLOYEES, PROPOSED COMPENSATION PACKAGES ARE DETERMINED BY USING COMPARABLE DATA AND/OR ENGAGING AN INDEPENDENT COMPENSATION AND BENEFITS CONSULTING FIRM.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>METHOD OF MAKING DOCUMENTS AVAILABLE TO THE PUBLIC THESE DOCUMENTS ARE MADE AVAILABLE UPON WRITTEN REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
