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      <Form990PartVIISectionAGrp>
        <PersonNm>Kenneth S Blumenfeld</PersonNm>
        <TitleTxt>Regional Director (Until 04/04/23)</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Shaun Thomas O'Leary</PersonNm>
        <TitleTxt>Regional Director</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>5.00</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Mark E Linskey</PersonNm>
        <TitleTxt>Regional Director</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>5.00</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Mark R Iantosca</PersonNm>
        <TitleTxt>Regional Director</TitleTxt>
        <AverageHoursPerWeekRt>5.00</AverageHoursPerWeekRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Ann M Parr</PersonNm>
        <TitleTxt>Regional Director (Until 04/04/23)</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>5.00</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Sharon Woods Webb</PersonNm>
        <TitleTxt>Regional Director</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Kathleen T Craig</PersonNm>
        <TitleTxt>CEO</TitleTxt>
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        <PersonNm>Carol Jones</PersonNm>
        <TitleTxt>CFO (as of 03/2023)</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Gillian L Shasby</PersonNm>
        <TitleTxt>Director of Publications</TitleTxt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Mary Beth Yeaton</PersonNm>
        <TitleTxt>Director of Finance</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>James Dell</PersonNm>
        <TitleTxt>IT Systems and Services Manager</TitleTxt>
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          <BusinessName>
            <BusinessNameLine1Txt>Freeman Audio Visual</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO Box 734596</AddressLine1Txt>
            <CityNm>Dallas</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>75373</ZIPCd>
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        <ServicesDesc>Audio Visual Services</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Dartmouth Printing Company</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO Box 419817</AddressLine1Txt>
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            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02241</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Printing Services</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Advanced Resources</BusinessNameLine1Txt>
          </BusinessName>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO Box 827932</AddressLine1Txt>
            <CityNm>Philadelphia</CityNm>
            <StateAbbreviationCd>PA</StateAbbreviationCd>
            <ZIPCd>19182</ZIPCd>
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        </ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>NimbleUser</BusinessNameLine1Txt>
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        </ContractorName>
        <ContractorAddress>
          <USAddress>
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            <CityNm>Dallas</CityNm>
            <StateAbbreviationCd>TX</StateAbbreviationCd>
            <ZIPCd>75312</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Software Services</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>PRA Events Inc</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1 North LaSalle Street - Suite 180</AddressLine1Txt>
            <CityNm>Chicago</CityNm>
            <StateAbbreviationCd>IL</StateAbbreviationCd>
            <ZIPCd>60602</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Annual Meeting Services</ServicesDesc>
        <CompensationAmt>519799</CompensationAmt>
      </ContractorCompensationGrp>
      <CntrctRcvdGreaterThan100KCnt>24</CntrctRcvdGreaterThan100KCnt>
      <AllOtherContributionsAmt>116000</AllOtherContributionsAmt>
      <TotalContributionsAmt>116000</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>Annual Dues</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>3246748</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>3246748</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>Contract Service Reven</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>700345</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>700345</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>Enduring Materials</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>7230</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>7230</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>3954323</TotalProgramServiceRevenueAmt>
      <OtherRevenueMiscGrp>
        <Desc>On-Line Career Center</Desc>
        <BusinessCd>561300</BusinessCd>
        <TotalRevenueColumnAmt>36730</TotalRevenueColumnAmt>
        <UnrelatedBusinessRevenueAmt>36730</UnrelatedBusinessRevenueAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueMiscGrp>
        <Desc>Online Advertising</Desc>
        <BusinessCd>517000</BusinessCd>
        <TotalRevenueColumnAmt>27892</TotalRevenueColumnAmt>
        <UnrelatedBusinessRevenueAmt>27892</UnrelatedBusinessRevenueAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueMiscGrp>
        <Desc>Periodical Advertising</Desc>
        <BusinessCd>513120</BusinessCd>
        <TotalRevenueColumnAmt>1700</TotalRevenueColumnAmt>
        <UnrelatedBusinessRevenueAmt>1700</UnrelatedBusinessRevenueAmt>
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      <OtherRevenueTotalAmt>66322</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>4136645</TotalRevenueColumnAmt>
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        <UnrelatedBusinessRevenueAmt>66322</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
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      <OtherSalariesAndWagesGrp>
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      <FeesForServicesManagementGrp>
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      <FeesForServicesLegalGrp>
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      <FeesForServicesOtherGrp>
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      <InformationTechnologyGrp>
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      <OccupancyGrp>
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      <TravelGrp>
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      <ConferencesMeetingsGrp>
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      </ConferencesMeetingsGrp>
      <DepreciationDepletionGrp>
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      </DepreciationDepletionGrp>
      <OtherExpensesGrp>
        <Desc>Audtio Visual</Desc>
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      <TotalFunctionalExpensesGrp>
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      <AccountsReceivableGrp>
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        <EOYAmt>20300748</EOYAmt>
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      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>38824</BOYAmt>
        <EOYAmt>86749</EOYAmt>
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      <InvestmentsProgramRelatedGrp>
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        <EOYAmt>1340000</EOYAmt>
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      <OtherAssetsTotalGrp>
        <BOYAmt>10320796</BOYAmt>
        <EOYAmt>30678176</EOYAmt>
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      <TotalAssetsGrp>
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        <EOYAmt>52405673</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>16339208</BOYAmt>
        <EOYAmt>41883782</EOYAmt>
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      <DeferredRevenueGrp>
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        <EOYAmt>4309290</EOYAmt>
      </DeferredRevenueGrp>
      <OtherLiabilitiesGrp>
        <BOYAmt>2096518</BOYAmt>
        <EOYAmt>6192599</EOYAmt>
      </OtherLiabilitiesGrp>
      <TotalLiabilitiesGrp>
        <BOYAmt>19973565</BOYAmt>
        <EOYAmt>52385671</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>19002</BOYAmt>
        <EOYAmt>20002</EOYAmt>
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      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>19002</BOYAmt>
        <EOYAmt>20002</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>19992567</BOYAmt>
        <EOYAmt>52405673</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
      <ReconcilationRevenueExpnssAmt>1464509</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>-1463509</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>0</FSAuditedInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleC documentId="RetDoc1039700001">
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      <OnlyInHouseLobbyingInd>0</OnlyInHouseLobbyingInd>
      <AgreeCarryoverPriorYearInd>1</AgreeCarryoverPriorYearInd>
      <DuesAssessmentsAmt>3246748</DuesAssessmentsAmt>
      <NonDeductibleLbbyngPltclCYAmt>244450</NonDeductibleLbbyngPltclCYAmt>
      <NonDedLbbyngPltclCyovAmt>69082</NonDedLbbyngPltclCyovAmt>
      <NonDeductibleLbbyngPltclTotAmt>313532</NonDeductibleLbbyngPltclTotAmt>
      <AggregateReportedDuesNtcAmt>162337</AggregateReportedDuesNtcAmt>
      <CarriedOverAmt>151195</CarriedOverAmt>
    </IRS990ScheduleC>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <TotalBookValueLandBuildingsAmt>0</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
        <Desc>Intercompany Balances</Desc>
        <BookValueAmt>30678176</BookValueAmt>
      </OtherAssetsOrgGrp>
      <TotalBookValueOtherAssetsAmt>30678176</TotalBookValueOtherAssetsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>Intercompany Balance</Desc>
        <Amt>6192599</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>6192599</TotalLiabilityAmt>
    </IRS990ScheduleD>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Kathleen T Craig</PersonNm>
        <TitleTxt>CEO</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>547744</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>30500</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>15355</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>593599</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Gillian L Shasby</PersonNm>
        <TitleTxt>Director of Publications</TitleTxt>
        <BaseCompensationFilingOrgAmt>138929</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>10000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>23246</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>11034</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>183209</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Mary Beth Yeaton</PersonNm>
        <TitleTxt>Director of Finance</TitleTxt>
        <BaseCompensationFilingOrgAmt>138871</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>2000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>23542</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>3005</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>167418</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>The compensation of the Chief Executive Officer was determined by the related organization, American Association of Neurosurgeons, Inc. The following methods were used: -Compensation survey or study -Approval by the board or compensation committee</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>All members of the AANS shall automatically be considered members of the same category of the Association. The members elected to the AANS shall be divided into twelve categories: A. Fellow B. Provisional/Provisional Affiliate C. Affiliate D. International E. Lifetime F. Candidate G. International Candidate H. Honorary I. Associate J. Advanced Practice Provider K. Allied L. Medical Student Only Fellows, Provisional, and Lifetime Members may vote. Only Fellows may hold office.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>The Officers and Directors shall be nominated and elected by the Members.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Form 990 is reviewed within the Association's Accounting Department by the Accounting Manager, Director of Finance, and Chief Financial Officer. Input for Form 990 inclusion is submitted to the Association's tax preparer by the Accounting Department. After Form 990 is completed by the Association's tax preparer, the Form 990 is again reviewed by both the Accounting Manager and Chief Financial Officer prior to filing with the IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>As a CME provided accredited by the ACCME, the AANS requires all individuals (and their significant others) in a position to influence and/or control the content of AANS directly and jointly sponsored CME activities to disclose to the AANS and subsequently to learners that the individual either has no relevant financial relationship or has any relevant financial relationships with a commercial interest. All disclosure information must be provided to AANS CME activity participants prior to the beginning of the CME activity. If a disclosure is not completed, the individual will not participate in the activity. All potential conflicts of interest identified through review of the disclosure form must be resolved in order for individuals in a position to influence and/or control CME content to be confirmed for the educational assignment. The resolution process and documents must be documented in the CME activity file. A conflict of interest disclosure must also be completed yearly by AANS Committee Members. Anyone who does not complete the disclosure will not participate on the Committee.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>The compensation for the Chief Executive Officer and the Chief Financial Officer was determined by the related organization: American Association of Neurosurgeons, Inc. The following process was used: The Chief Executive Officer's annual compensation is subject to the provisions in their employment contract: the Executive shall receive a base salary, paid in accordance with the Association's normal payroll practices. Effective as of January 1, 2016, the Executive's base salary shall be at an annual rate of $325,000, and shall increase three percent (3%) on January 1st of each year. In addition, during the period of November 1, 2018 through December 31, 2018, the Association and the Executives agree to meet in good faith to renegotiate the Executive's base salary to determine any other appropriate increase. The Association may award the Executive bonuses in such amounts and at such times as the Association's Review Committee, in his or her sole discretion, deems appropriate. This process is documented. Compensation for the CFO and Associate Executive Directors is determined by the Chief Executive Officer. The CEO's basis for determining compensation is based on market data including the Association Forum of Chicagoland.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization makes its governing documents, conflict of interest policy and financial statements available to the public upon request for the same period of disclosure as set forth in IRC Section 6104(d).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, line 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>Transfer to American Association of Neurosurgeons, Inc. -1,463,509.</ExplanationTxt>
      </SupplementalInformationDetail>
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          <BusinessNameLine1Txt>American Association of Neurosurgeons Inc</BusinessNameLine1Txt>
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          <AddressLine1Txt>5550 Meadowbrook Industrial Court</AddressLine1Txt>
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