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        <PersonNm>MARC RUEL MD</PersonNm>
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        <PersonNm>RAFAEL J SADABA</PersonNm>
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        <PersonNm>ALAN D SIHOE MD</PersonNm>
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        <PersonNm>ARA A VAPORCIYAN MD</PersonNm>
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        <PersonNm>ELAINE WEISS</PersonNm>
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        <PersonNm>WILLIAM SEWARD</PersonNm>
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        <PersonNm>GRAHAME RUSH</PersonNm>
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        <PersonNm>ROBERT HABIB</PersonNm>
        <TitleTxt>VICE PRESIDENT, STS RESEARCH CENTER</TitleTxt>
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        <PersonNm>CHARLIE SIMPSON</PersonNm>
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        <PersonNm>AVIDAN STERN</PersonNm>
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        <PersonNm>KEITH BURA</PersonNm>
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        <PersonNm>SCOTT BRADBURY</PersonNm>
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        <PersonNm>DEREK BRANDT</PersonNm>
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        <PersonNm>JANE HAN</PersonNm>
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        <PersonNm>HARIS SUBACIUS</PersonNm>
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        <PersonNm>COLLEEN DONOHOE</PersonNm>
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        <PersonNm>LEE WIENSCH</PersonNm>
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        <PersonNm>BETH WINER</PersonNm>
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        <Desc>TAX EXPENSES</Desc>
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        <ConsolidatedBasisFinclStmtInd>X</ConsolidatedBasisFinclStmtInd>
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    <IRS990ScheduleB documentId="RetDoc1234500001">
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        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
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        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>ACCOUNTING PRINCIPLES GENERALLY ACCEPTED IN THE UNITED STATES OF AMERICA REQUIRE MANAGEMENT TO EVALUATE TAX POSITIONS TAKEN BY THE SOCIETY AND RECOGNIZE A TAX LIABILITY IF THE SOCIETY HAS TAKEN AN UNCERTAIN POSITION THAT MORE LIKELY THAN NOT WOULD NOT BE SUSTAINED UPON EXAMINATION BY THE IRS OR OTHER APPLICABLE TAXING AUTHORITIES. MANAGEMENT HAS ANALYZED THE TAX POSITIONS TAKEN BY THE SOCIETY AND HAS CONCLUDED THAT, AS OF DECEMBER 31, 2023, THERE ARE NO UNCERTAIN POSITIONS TAKEN OR EXPECTED TO BE TAKEN THAT WOULD REQUIRE RECOGNITION OF A LIABILITY OR DISCLOSURE IN THE CONSOLIDATED FINANCIAL STATEMENTS.</ExplanationTxt>
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        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>EACTS MEETING PARTICIPATION</TypeOfActivitiesConductedTxt>
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      <AccountActivitiesOutsideUSGrp>
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        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
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      <SubtotalEmployeesCnt>0</SubtotalEmployeesCnt>
      <ContinuationTotalOfficeCnt>0</ContinuationTotalOfficeCnt>
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      <TotalOfficeCnt>0</TotalOfficeCnt>
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      <SubtotalSpentAmt>211901</SubtotalSpentAmt>
      <ContinuationSpentAmt>0</ContinuationSpentAmt>
      <TotalSpentAmt>211901</TotalSpentAmt>
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      <RecipientTable>
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        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>SCOTT BRADBURY</PersonNm>
        <TitleTxt>VICE PRESIDENT, EDUCATION</TitleTxt>
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        <DeferredCompensationFlngOrgAmt>22214</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>33254</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>296207</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JANE HAN</PersonNm>
        <TitleTxt>VICE PRESIDENT, QUALITY AND RESEARCH</TitleTxt>
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        <DeferredCompensationFlngOrgAmt>21176</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>11928</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>267918</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DEREK BRANDT</PersonNm>
        <TitleTxt>VP, GOVERNMENT RELATIONS</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <DeferredCompensationFlngOrgAmt>15020</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>1791</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>242099</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>KEVIN GILMARTIN</PersonNm>
        <TitleTxt>DIRECTOR, INFORMATION TECHNOLOGY</TitleTxt>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>28718</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>HARIS SUBACIUS</PersonNm>
        <TitleTxt>ASSOC. DIRECTOR OF DATABASE ANALYTIC</TitleTxt>
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        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>17767</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>2683</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>217854</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>COLLEEN DONOHOE</PersonNm>
        <TitleTxt>VICE PRESIDENT,MEETINGS AND CONVENTI</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>11571</NontaxableBenefitsFilingOrgAmt>
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        <TotalCompensationFilingOrgAmt>210321</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>LEE WIENSCH</PersonNm>
        <TitleTxt>TSF EXECUTIVE DIRECTOR</TitleTxt>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <TotalCompensationFilingOrgAmt>205888</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>BETH WINER</PersonNm>
        <TitleTxt>ASSOC. DIRECTOR MEMBER ENGAGEMENT</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 4B</FormAndLineReferenceDesc>
        <ExplanationTxt>LINE 4B: THE SOCIETY OF THORACIC SURGEONS HAS ESTABLISHED A NON-QUALIFIED SECTION 457(F) DEFERRED COMPENSATION PLAN. THE SOCIETY CREDITS PARTICIPANTS ACCOUNTS WHICH ARE RECORDED ON FORM 990 AS DEFERRED COMPENSATION. THESE BALANCES VEST OVER A THREE-YEAR PERIOD. PARTICIPANT BALANCES ARE SUBJECT TO FORFEITURE PRIOR TO VESTING. THE PLAN CONTRIBUTIONS ARE HELD IN A RABBI TRUST AND REMAIN THE ASSET OF THE ORGANIZATION AND ARE SUBJECT TO THE CLAIMS OF THE ORGANIZATION'S GENERAL CREDITORS UNTIL SUCH AMOUNTS ARE PAID OUT TO THE INDIVIDUAL. DURING THE YEAR, ELAINE WEISS PARTICIPATED IN A NON-QUALIFIED SECTION 457(F) DEFERRED COMPENSATION PLAN. A DISTRIBUTION OF $32,243 WAS MADE FROM THE PLAN IN 2023.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 7</FormAndLineReferenceDesc>
        <ExplanationTxt>AS INDICATED IN SCHEDULE J, PART II, CEO/EXECUTIVE DIRECTOR, KEY EMPLOYEES AND HIGHLY COMPENSATED EMPLOYEES OF THE ORGANIZATION ARE ELIGIBLE TO RECEIVE A BONUS BASED ON PERFORMANCE METRICS AND THE FINANCIAL RESULTS OF THE ORGANIZATION. THIS BONUS WAS APPROVED BY BOARD OF DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION AMENDED ITS BYLAWS AS OF JANUARY 2023. THE FOLLOWING ITEMS WERE REVISED: ARTICLE III, SECTION I - THE TYPES OF MEMBERSHIP WERE CHANGED FROM SEVEN TO SIX TYPES OF MEMBERSHIPS. THE MEMBERSHIPS SHALL NOW BE: SURGEON, SENIOR, HONORARY, RESIDENT/FELLOW, MEDICAL STUDENT AND ASSOCIATE. SURGEON MEMBERSHIP NOW INCLUDES WHAT WAS HISTORICALLY KNOWN AS BOTH ACTIVE AND INTERNATIONAL MEMBERS. THEREFORE A SURGEON MEMBER MUST HAVE ACHIEVED APPROPRIATE CERTIFICATION THE UNITED STATES, CANADA OR ANY OTHER COUNTRY, SO LONG AS APPROPRIATE DOCUMENTATION OF PROFESSIONAL ACHIEVEMENTS IS PROVIDED TO THE MEMBERSHIP COMMITTEE. ARTICLE V, SECTION 2 - THE NUMBER OF DIRECTORS WAS ADJUSTED TO BE BETWEEN 19-22. THE PUBLIC DIRECTOR POSITION WAS ELIMINATED AS A BOARD OF DIRECTOR POSITION. ARTICLE X, SECTION 5 - THE NUMBER OF COMMITTEES IN WHICH THE COUNCIL SHALL BE DIVIDED INTO HAS CHANGED FROM 4 TO SEVERAL COUNCILS, AND IS BASED ON BOARD OF DIRECTORS DETERMINATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION IS A MEMBERSHIP SOCIETY AND HAS OVER 7,700 MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS OF THE GOVERNING BODY ARE ELECTED BY THE MEMBERSHIP AT ITS ANNUAL MEETING PURSUANT TO THE ORGANIZATION'S BYLAWS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>CERTAIN DECISIONS OF THE GOVERNING BODY (E.G., BYLAWS AMENDMENTS) ARE SUBJECT TO APPROVAL BY MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION RETAINED THE SERVICES OF AN INDEPENDENT CPA FIRM TO PREPARE ITS FORM 990. MANAGEMENT THEN REVIEWED THE COMPLETED FORM 990 AND PROVIDED A FULL COPY TO ALL VOTING MEMBERS OF THE ORGANIZATION'S BOARD OF DIRECTORS (I.E., THE GOVERNING BODY). THE VOTING MEMBERS OF THE GOVERNING BODY WERE GIVEN A REASONABLE AMOUNT OF TIME TO REVIEW THE RETURN AND ASK ANY QUESTIONS DIRECTLY TO MANAGEMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>OFFICERS, DIRECTORS, KEY EMPLOYEES, AND OTHERS ARE ANNUALLY REQUIRED TO COMPLETE A CONFLICT OF INTEREST DISCLOSURE STATEMENT AS A REQUIREMENT OF SERVICE. THE STATEMENT ON STS DISCLOSURE POLICY AND GUIDELINES REGARDING CONFLICTS OF INTEREST IS READ AT THE BEGINNING OF EVERY BOARD OF DIRECTORS, COMMITTEE, COUNCIL OPERATING BOARD, AND WORKFORCE MEETING. IF A CONFLICT OF INTEREST OR THE APPEARANCE OF A CONFLICT OF INTEREST EXISTS, THE PERSON WITH SUCH A CONFLICT MUST DISCLOSE THE RELATIONSHIP AND REFRAIN FROM VOTING ON THE MATTER; IF THE NATURE OF THE RELATIONSHIP SUGGESTS THAT HIS OR HER PRESENCE MAY BE DETRIMENTAL TO THE DISCUSSION, HE OR SHE MUST EXIT THE MEETING. THE MEETING CHAIR MAKES THE FINAL DETERMINATION AS TO THE APPROPRIATE ACTION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>15A. THE SOCIETY ENGAGES AN INDEPENDENT COMPENSATION CONSULTANT ANNUALLY TO PERFORM A MARKET SALARY ANALYSIS FOR THE CEO/EXECUTIVE DIRECTOR POSITION. THIS INFORMATION IS SHARED WITH THE EXECUTIVE COMMITTEE WHICH DETERMINES THE NEW LEVEL OF COMPENSATION AND COMMUNICATES THE SALARY INFORMATION TO THE CEO/EXECUTIVE DIRECTOR AND TO THE VICE PRESIDENT OF FINANCE &amp; ADMINISTRATION FOR IMPLEMENTATION. AN ADJUSTMENT IS MADE TO THE CEO/EXECUTIVE DIRECTOR'S SALARY ANNUALLY FOR A MERIT INCREASE, WHICH IS BASED ON A FORMAL PERFORMANCE EVALUATION. 15B. COMPENSATION - THE SOCIETY ENGAGES AN INDEPENDENT COMPENSATION CONSULTANT PERIODICALLY, USUALLY EVERY TWO OR THREE YEARS, TO PERFORM A MARKET SALARY ANALYSIS FOR STS POSITIONS. THE CONSULTANT MEETS WITH HUMAN RESOURCES TO ASCERTAIN INFORMATION RELEVANT TO EACH POSITION. THE CONSULTANT ALSO REVIEWS EACH OF THE POSITION DESCRIPTIONS, DETERMINES APPROPRIATE MATCHES FROM COMPENSATION MARKET SURVEYS, E.G., TOWERS WATSON, PRM, ASSOCIATION FORUM, AND ASAE, FOR COMPARABLE POSITIONS AT SIMILARLY SITUATED ORGANIZATIONS, AND COMPILES AND ANALYZES THIS MARKET DATA FOR EACH POSITION. THE CONSULTANT MEETS WITH THE CEO/EXECUTIVE DIRECTOR, VICE PRESIDENT OF FINANCE &amp; ADMINISTRATION AND ASSOCIATE DIRECTOR OF HUMAN RESOURCES TO REVIEW THE COMPENSATION ANALYSIS, AND MAKES ADJUSTMENTS TO THE ANALYSIS, AS APPROPRIATE. UTILIZING THE CONSULTANT'S ANALYSIS, THE CEO/EXECUTIVE DIRECTOR MAKES SALARY ADJUSTMENTS. AN INDEPENDENT COMPENSATION CONSULTANT WAS UTILIZED AS PART OF THIS PROCESS IN 2021. ADJUSTMENTS ARE MADE TO SALARIES ANNUALLY FOR MERIT INCREASES, WHICH ARE BASED ON FORMAL PERFORMANCE EVALUATIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S BYLAWS AND KEY GOVERNANCE POLICIES ARE AVAILABLE TO THE PUBLIC ON THE STS WEBSITE. OTHER GOVERNING DOCUMENTS, AS WELL AS THE ORGANIZATION'S CONFLICT OF INTEREST POLICY AND FINANCIAL STATEMENTS ARE MADE AVAILABLE TO THE PUBLIC UPON WRITTEN REQUEST TO THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>CONSULTANT EXPENSES 1,213,870. TEMPORARY SERVICES FROM SALARIES 244,046. VOLUNTEER STIPENDS FROM SALARIES 300,000. PAYROLL AND HR FEES 216,013. DATA WAREHOUSING AND ANALYSIS 6,654,611. VIDEO PRODUCTION 70,034. CTS NET FEES 22,563. MISCELLANEOUS 71,866. TVT EXPENSE 2,651,487.</ExplanationTxt>
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      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
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      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
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      <ReimbursementPaidByOtherOrgInd>1</ReimbursementPaidByOtherOrgInd>
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