<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.irs.gov/efile" returnVersion="2023v5.1">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2024-07-25T15:04:36-05:00</ReturnTs>
    <TaxPeriodEndDt>2023-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>420714325</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>RSM US LLP</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>227 WEST FIRST STREET SUITE 700</AddressLine1Txt>
        <CityNm>DULUTH</CityNm>
        <StateAbbreviationCd>MN</StateAbbreviationCd>
        <ZIPCd>55802</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990</ReturnTypeCd>
    <TaxPeriodBeginDt>2023-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>411793954</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>AMERICAN ACADEMY OF NEUROLOGICAL SURGERY</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>AMER</BusinessNameControlTxt>
      <PhoneNum>6148021677</PhoneNum>
      <USAddress>
        <AddressLine1Txt>200 FIRST ST SW</AddressLine1Txt>
        <CityNm>ROCHESTER</CityNm>
        <StateAbbreviationCd>MN</StateAbbreviationCd>
        <ZIPCd>55905</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>DR RUSSELL LONSER</PersonNm>
      <PersonTitleTxt>TREASURER</PersonTitleTxt>
      <PhoneNum>2165136255</PhoneNum>
      <SignatureDt>2024-07-25</SignatureDt>
      <DiscussWithPaidPreparerInd>1</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <SigningOfficerGrp>
      <PersonFullName>
        <PersonFirstNm>DR</PersonFirstNm>
        <PersonLastNm>RUSSELL LONSER</PersonLastNm>
      </PersonFullName>
      <SSN>XXX-XX-XXXX</SSN>
    </SigningOfficerGrp>
    <IRSResponsiblePrtyInfoCurrInd>0</IRSResponsiblePrtyInfoCurrInd>
    <PreparerPersonGrp>
      <PreparerPersonNm>JULIE BOYER</PreparerPersonNm>
      <PTIN>P01278549</PTIN>
      <PhoneNum>2187275025</PhoneNum>
      <PreparationDt>2024-07-25</PreparationDt>
    </PreparerPersonGrp>
    <AdditionalFilerInformation>
      <TrustedCustomerGrp>
        <TrustedCustomerCd>3</TrustedCustomerCd>
        <AuthenticationAssuranceLevelCd>AAL1</AuthenticationAssuranceLevelCd>
        <IdentityAssuranceLevelCd>IAL1</IdentityAssuranceLevelCd>
      </TrustedCustomerGrp>
    </AdditionalFilerInformation>
    <TaxYr>2023</TaxYr>
    <BuildTS>2023-04-26 12:10:37Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="4">
    <IRS990 documentId="RetDoc1038000001" referenceDocumentId="RetDoc1044400001">
      <AddressChangeInd>X</AddressChangeInd>
      <PrincipalOfficerNm>DR RUSSELL LONSER</PrincipalOfficerNm>
      <USAddress>
        <AddressLine1Txt>2515 TREMONT RD</AddressLine1Txt>
        <CityNm>UPPER ARLINGTON</CityNm>
        <StateAbbreviationCd>OH</StateAbbreviationCd>
        <ZIPCd>43221</ZIPCd>
      </USAddress>
      <GrossReceiptsAmt>768428</GrossReceiptsAmt>
      <GroupReturnForAffiliatesInd>0</GroupReturnForAffiliatesInd>
      <Organization501c3Ind>X</Organization501c3Ind>
      <WebsiteAddressTxt>WWW.AMERICANACADEMYNS.ORG</WebsiteAddressTxt>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <FormationYr>1994</FormationYr>
      <LegalDomicileStateCd>MN</LegalDomicileStateCd>
      <ActivityOrMissionDesc>TO ENCOURAGE AND DISSEMINATE THE KNOWLEDGE OF NEUROLOGY AND NEUROLOGICAL SURGERICAL MEDICINE.</ActivityOrMissionDesc>
      <VotingMembersGoverningBodyCnt>7</VotingMembersGoverningBodyCnt>
      <VotingMembersIndependentCnt>7</VotingMembersIndependentCnt>
      <TotalEmployeeCnt>0</TotalEmployeeCnt>
      <TotalVolunteersCnt>7</TotalVolunteersCnt>
      <TotalGrossUBIAmt>0</TotalGrossUBIAmt>
      <NetUnrelatedBusTxblIncmAmt>0</NetUnrelatedBusTxblIncmAmt>
      <PYContributionsGrantsAmt>408906</PYContributionsGrantsAmt>
      <CYContributionsGrantsAmt>371750</CYContributionsGrantsAmt>
      <PYProgramServiceRevenueAmt>193219</PYProgramServiceRevenueAmt>
      <CYProgramServiceRevenueAmt>363894</CYProgramServiceRevenueAmt>
      <PYInvestmentIncomeAmt>24006</PYInvestmentIncomeAmt>
      <CYInvestmentIncomeAmt>32784</CYInvestmentIncomeAmt>
      <PYOtherRevenueAmt>0</PYOtherRevenueAmt>
      <CYOtherRevenueAmt>0</CYOtherRevenueAmt>
      <PYTotalRevenueAmt>626131</PYTotalRevenueAmt>
      <CYTotalRevenueAmt>768428</CYTotalRevenueAmt>
      <PYGrantsAndSimilarPaidAmt>0</PYGrantsAndSimilarPaidAmt>
      <CYGrantsAndSimilarPaidAmt>0</CYGrantsAndSimilarPaidAmt>
      <PYBenefitsPaidToMembersAmt>0</PYBenefitsPaidToMembersAmt>
      <CYBenefitsPaidToMembersAmt>0</CYBenefitsPaidToMembersAmt>
      <PYSalariesCompEmpBnftPaidAmt>0</PYSalariesCompEmpBnftPaidAmt>
      <CYSalariesCompEmpBnftPaidAmt>0</CYSalariesCompEmpBnftPaidAmt>
      <PYTotalProfFndrsngExpnsAmt>0</PYTotalProfFndrsngExpnsAmt>
      <CYTotalProfFndrsngExpnsAmt>0</CYTotalProfFndrsngExpnsAmt>
      <CYTotalFundraisingExpenseAmt>0</CYTotalFundraisingExpenseAmt>
      <PYOtherExpensesAmt>504372</PYOtherExpensesAmt>
      <CYOtherExpensesAmt>895539</CYOtherExpensesAmt>
      <PYTotalExpensesAmt>504372</PYTotalExpensesAmt>
      <CYTotalExpensesAmt>895539</CYTotalExpensesAmt>
      <PYRevenuesLessExpensesAmt>121759</PYRevenuesLessExpensesAmt>
      <CYRevenuesLessExpensesAmt>-127111</CYRevenuesLessExpensesAmt>
      <TotalAssetsBOYAmt>1434591</TotalAssetsBOYAmt>
      <TotalAssetsEOYAmt>1455240</TotalAssetsEOYAmt>
      <TotalLiabilitiesBOYAmt>0</TotalLiabilitiesBOYAmt>
      <TotalLiabilitiesEOYAmt>0</TotalLiabilitiesEOYAmt>
      <NetAssetsOrFundBalancesBOYAmt>1434591</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>1455240</NetAssetsOrFundBalancesEOYAmt>
      <MissionDesc>THE ORGANIZATION'S MISSION IS TO FOSTER SCIENTIFIC DISCOVERY AND INNOVATIVE RESEARCH SEEKING TO BETTER THE LIVES OF PATIENTS SUFFERING FROM NEUROLOGICAL AND SURGICAL DISORDERS.</MissionDesc>
      <SignificantNewProgramSrvcInd>0</SignificantNewProgramSrvcInd>
      <SignificantChangeInd>0</SignificantChangeInd>
      <ExpenseAmt>873763</ExpenseAmt>
      <RevenueAmt>363894</RevenueAmt>
      <Desc>TO ENCOURAGE AND DISSEMINATE THE KNOWLEDGE AND RESEARCH OF NEUROLOGICAL SURGERY, AND IMPROVE THE QUALITY OF PATIENT CARE. THE ORGANIZATION SERVES APPROXIMATELY 220 PHYSICIANS AND PROVIDES EDUCATION THROUGH ITS ANNUAL MEETING AND EDUCATIONAL COURSES. THE ACADEMY ALSO SUPPORTS SEVERAL OTHER RESEARCH ENDEAVORS SUCH AS GRANTS FOR YOUNG INVESTIGATORS AND MENTORING ACTIVITIES MULTIPLE TIMES A YEAR.</Desc>
      <TotalProgramServiceExpensesAmt>873763</TotalProgramServiceExpensesAmt>
      <DescribedInSection501c3Ind referenceDocumentId="RetDoc1039100001">1</DescribedInSection501c3Ind>
      <ScheduleBRequiredInd referenceDocumentId="RetDoc1234500001">1</ScheduleBRequiredInd>
      <PoliticalCampaignActyInd>0</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>0</LobbyingActivitiesInd>
      <SubjectToProxyTaxInd>0</SubjectToProxyTaxInd>
      <DonorAdvisedFundInd>0</DonorAdvisedFundInd>
      <ConservationEasementsInd>0</ConservationEasementsInd>
      <CollectionsOfArtInd>0</CollectionsOfArtInd>
      <CreditCounselingInd>0</CreditCounselingInd>
      <DonorRstrOrQuasiEndowmentsInd>0</DonorRstrOrQuasiEndowmentsInd>
      <ReportLandBuildingEquipmentInd>0</ReportLandBuildingEquipmentInd>
      <ReportInvestmentsOtherSecInd>0</ReportInvestmentsOtherSecInd>
      <ReportProgramRelatedInvstInd>0</ReportProgramRelatedInvstInd>
      <ReportOtherAssetsInd>0</ReportOtherAssetsInd>
      <ReportOtherLiabilitiesInd>0</ReportOtherLiabilitiesInd>
      <IncludeFIN48FootnoteInd>0</IncludeFIN48FootnoteInd>
      <IndependentAuditFinclStmtInd>0</IndependentAuditFinclStmtInd>
      <ConsolidatedAuditFinclStmtInd>0</ConsolidatedAuditFinclStmtInd>
      <SchoolOperatingInd>0</SchoolOperatingInd>
      <ForeignOfficeInd>0</ForeignOfficeInd>
      <ForeignActivitiesInd>0</ForeignActivitiesInd>
      <MoreThan5000KToOrgInd>0</MoreThan5000KToOrgInd>
      <MoreThan5000KToIndividualsInd>0</MoreThan5000KToIndividualsInd>
      <ProfessionalFundraisingInd>0</ProfessionalFundraisingInd>
      <FundraisingActivitiesInd>0</FundraisingActivitiesInd>
      <GamingActivitiesInd>0</GamingActivitiesInd>
      <OperateHospitalInd>0</OperateHospitalInd>
      <GrantsToOrganizationsInd>0</GrantsToOrganizationsInd>
      <GrantsToIndividualsInd>0</GrantsToIndividualsInd>
      <ScheduleJRequiredInd>0</ScheduleJRequiredInd>
      <TaxExemptBondsInd>0</TaxExemptBondsInd>
      <EngagedInExcessBenefitTransInd>0</EngagedInExcessBenefitTransInd>
      <PYExcessBenefitTransInd>0</PYExcessBenefitTransInd>
      <LoanOutstandingInd>0</LoanOutstandingInd>
      <GrantToRelatedPersonInd>0</GrantToRelatedPersonInd>
      <BusinessRlnWithOrgMemInd>0</BusinessRlnWithOrgMemInd>
      <BusinessRlnWithFamMemInd>0</BusinessRlnWithFamMemInd>
      <BusinessRlnWith35CtrlEntInd>0</BusinessRlnWith35CtrlEntInd>
      <DeductibleNonCashContriInd>0</DeductibleNonCashContriInd>
      <DeductibleArtContributionInd>0</DeductibleArtContributionInd>
      <TerminateOperationsInd>0</TerminateOperationsInd>
      <PartialLiquidationInd>0</PartialLiquidationInd>
      <DisregardedEntityInd>0</DisregardedEntityInd>
      <RelatedEntityInd>0</RelatedEntityInd>
      <RelatedOrganizationCtrlEntInd>0</RelatedOrganizationCtrlEntInd>
      <TrnsfrExmptNonChrtblRltdOrgInd>0</TrnsfrExmptNonChrtblRltdOrgInd>
      <ActivitiesConductedPrtshpInd>0</ActivitiesConductedPrtshpInd>
      <ScheduleORequiredInd>1</ScheduleORequiredInd>
      <IRPDocumentCnt>1</IRPDocumentCnt>
      <IRPDocumentW2GCnt>0</IRPDocumentW2GCnt>
      <BackupWthldComplianceInd>1</BackupWthldComplianceInd>
      <EmployeeCnt>0</EmployeeCnt>
      <UnrelatedBusIncmOverLimitInd>0</UnrelatedBusIncmOverLimitInd>
      <ForeignFinancialAccountInd>0</ForeignFinancialAccountInd>
      <ProhibitedTaxShelterTransInd>0</ProhibitedTaxShelterTransInd>
      <TaxablePartyNotificationInd>0</TaxablePartyNotificationInd>
      <NondeductibleContributionsInd>0</NondeductibleContributionsInd>
      <QuidProQuoContributionsInd>0</QuidProQuoContributionsInd>
      <Form8282PropertyDisposedOfInd>0</Form8282PropertyDisposedOfInd>
      <RcvFndsToPayPrsnlBnftCntrctInd>0</RcvFndsToPayPrsnlBnftCntrctInd>
      <PayPremiumsPrsnlBnftCntrctInd>0</PayPremiumsPrsnlBnftCntrctInd>
      <IndoorTanningServicesInd>0</IndoorTanningServicesInd>
      <SubjToTaxRmnrtnExPrchtPymtInd>0</SubjToTaxRmnrtnExPrchtPymtInd>
      <SubjectToExcsTaxNetInvstIncInd>0</SubjectToExcsTaxNetInvstIncInd>
      <InfoInScheduleOPartVIInd>X</InfoInScheduleOPartVIInd>
      <GoverningBodyVotingMembersCnt>7</GoverningBodyVotingMembersCnt>
      <IndependentVotingMemberCnt>7</IndependentVotingMemberCnt>
      <FamilyOrBusinessRlnInd>0</FamilyOrBusinessRlnInd>
      <DelegationOfMgmtDutiesInd>0</DelegationOfMgmtDutiesInd>
      <ChangeToOrgDocumentsInd>0</ChangeToOrgDocumentsInd>
      <MaterialDiversionOrMisuseInd>0</MaterialDiversionOrMisuseInd>
      <MembersOrStockholdersInd>1</MembersOrStockholdersInd>
      <ElectionOfBoardMembersInd>1</ElectionOfBoardMembersInd>
      <DecisionsSubjectToApprovaInd>1</DecisionsSubjectToApprovaInd>
      <MinutesOfGoverningBodyInd>1</MinutesOfGoverningBodyInd>
      <MinutesOfCommitteesInd>1</MinutesOfCommitteesInd>
      <OfficerMailingAddressInd>0</OfficerMailingAddressInd>
      <LocalChaptersInd>0</LocalChaptersInd>
      <Form990ProvidedToGvrnBodyInd>1</Form990ProvidedToGvrnBodyInd>
      <ConflictOfInterestPolicyInd>0</ConflictOfInterestPolicyInd>
      <WhistleblowerPolicyInd>0</WhistleblowerPolicyInd>
      <DocumentRetentionPolicyInd>0</DocumentRetentionPolicyInd>
      <CompensationProcessCEOInd>0</CompensationProcessCEOInd>
      <CompensationProcessOtherInd>0</CompensationProcessOtherInd>
      <InvestmentInJointVentureInd>0</InvestmentInJointVentureInd>
      <StatesWhereCopyOfReturnIsFldCd>MN</StatesWhereCopyOfReturnIsFldCd>
      <UponRequestInd>X</UponRequestInd>
      <BooksInCareOfDetail>
        <PersonNm>DR RUSSELL LONSER</PersonNm>
        <PhoneNum>2165136255</PhoneNum>
        <USAddress>
          <AddressLine1Txt>2515 TREMONT RD</AddressLine1Txt>
          <CityNm>UPPER ARLINGTON</CityNm>
          <StateAbbreviationCd>OH</StateAbbreviationCd>
          <ZIPCd>43221</ZIPCd>
        </USAddress>
      </BooksInCareOfDetail>
      <NoListedPersonsCompensatedInd>X</NoListedPersonsCompensatedInd>
      <Form990PartVIISectionAGrp>
        <PersonNm>SHENANDOAH ROBINSON MD</PersonNm>
        <TitleTxt>PRESIDENT</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>E SANDER CONNOLLY JR MD</PersonNm>
        <TitleTxt>PRESIDENT-ELECT</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>ANIL NANDA</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>SEPI AMIN-HANJANI MD</PersonNm>
        <TitleTxt>SECRETARY</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>RUSSELL LONSER MD</PersonNm>
        <TitleTxt>TREASURER</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>FRED G BARKER II MD</PersonNm>
        <TitleTxt>PAST PRESIDENT</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>MICHAEL SCHULDER MD</PersonNm>
        <TitleTxt>HISTORIAN</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>AVIVA ABOSCH</PersonNm>
        <TitleTxt>MEMBER AT LARGE</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>0</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>0</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>0</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>0</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <CntrctRcvdGreaterThan100KCnt>0</CntrctRcvdGreaterThan100KCnt>
      <MembershipDuesAmt>116250</MembershipDuesAmt>
      <AllOtherContributionsAmt>255500</AllOtherContributionsAmt>
      <TotalContributionsAmt>371750</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>MEETING, REGISTRATION</Desc>
        <BusinessCd>611600</BusinessCd>
        <TotalRevenueColumnAmt>363894</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>363894</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>363894</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>32784</TotalRevenueColumnAmt>
        <ExclusionAmt>32784</ExclusionAmt>
      </InvestmentIncomeGrp>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>768428</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>363894</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>32784</ExclusionAmt>
      </TotalRevenueGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>1728</TotalAmt>
        <ManagementAndGeneralAmt>1728</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <OfficeExpensesGrp>
        <TotalAmt>960</TotalAmt>
        <ManagementAndGeneralAmt>960</ManagementAndGeneralAmt>
      </OfficeExpensesGrp>
      <TravelGrp>
        <TotalAmt>1060</TotalAmt>
        <ManagementAndGeneralAmt>1060</ManagementAndGeneralAmt>
      </TravelGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>705756</TotalAmt>
        <ProgramServicesAmt>705756</ProgramServicesAmt>
      </ConferencesMeetingsGrp>
      <OtherExpensesGrp>
        <Desc>ACADEMY AWARDS/PRIZES</Desc>
        <TotalAmt>162000</TotalAmt>
        <ProgramServicesAmt>162000</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>PAYPAL, BANK &amp; REGISTRA</Desc>
        <TotalAmt>18028</TotalAmt>
        <ManagementAndGeneralAmt>18028</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>DUES &amp; SUBSCRIPTIONS</Desc>
        <TotalAmt>6007</TotalAmt>
        <ProgramServicesAmt>6007</ProgramServicesAmt>
      </OtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>895539</TotalAmt>
        <ProgramServicesAmt>873763</ProgramServicesAmt>
        <ManagementAndGeneralAmt>21776</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </TotalFunctionalExpensesGrp>
      <CashNonInterestBearingGrp>
        <BOYAmt>107244</BOYAmt>
        <EOYAmt>17298</EOYAmt>
      </CashNonInterestBearingGrp>
      <AccountsReceivableGrp>
        <BOYAmt>103053</BOYAmt>
        <EOYAmt>103103</EOYAmt>
      </AccountsReceivableGrp>
      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>736</BOYAmt>
        <EOYAmt>736</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <InvestmentsPubTradedSecGrp>
        <BOYAmt>1208729</BOYAmt>
        <EOYAmt>1319274</EOYAmt>
      </InvestmentsPubTradedSecGrp>
      <OtherAssetsTotalGrp>
        <BOYAmt>14829</BOYAmt>
        <EOYAmt>14829</EOYAmt>
      </OtherAssetsTotalGrp>
      <TotalAssetsGrp>
        <BOYAmt>1434591</BOYAmt>
        <EOYAmt>1455240</EOYAmt>
      </TotalAssetsGrp>
      <TotalLiabilitiesGrp>
        <BOYAmt>0</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>1434591</BOYAmt>
        <EOYAmt>1455240</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>1434591</BOYAmt>
        <EOYAmt>1455240</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>1434591</BOYAmt>
        <EOYAmt>1455240</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>-127111</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>147760</NetUnrlzdGainsLossesInvstAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>0</FSAuditedInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PubliclySupportedOrg509a2Ind>X</PubliclySupportedOrg509a2Ind>
      <GiftsGrantsContrisRcvd509Grp>
        <CurrentTaxYearMinus4YearsAmt>223007</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>82500</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>321165</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>408906</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>371250</CurrentTaxYearAmt>
        <TotalAmt>1406828</TotalAmt>
      </GiftsGrantsContrisRcvd509Grp>
      <GrossReceiptsAdmissionsGrp>
        <CurrentTaxYearMinus4YearsAmt>231264</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>180474</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>193219</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>363894</CurrentTaxYearAmt>
        <TotalAmt>968851</TotalAmt>
      </GrossReceiptsAdmissionsGrp>
      <Total509Grp>
        <CurrentTaxYearMinus4YearsAmt>454271</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>82500</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>501639</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>602125</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>735144</CurrentTaxYearAmt>
        <TotalAmt>2375679</TotalAmt>
      </Total509Grp>
      <AmountsRcvdDsqlfyPersonGrp>
        <CurrentTaxYearMinus4YearsAmt>12975</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>6000</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>5625</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>9000</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>9750</CurrentTaxYearAmt>
        <TotalAmt>43350</TotalAmt>
      </AmountsRcvdDsqlfyPersonGrp>
      <SubstantialContributorsAmtGrp>
        <TotalAmt>0</TotalAmt>
      </SubstantialContributorsAmtGrp>
      <SubstAndDsqlfyPrsnsTotGrp>
        <CurrentTaxYearMinus4YearsAmt>12975</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>6000</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>5625</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>9000</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>9750</CurrentTaxYearAmt>
        <TotalAmt>43350</TotalAmt>
      </SubstAndDsqlfyPrsnsTotGrp>
      <PublicSupportTotal509Amt>2332329</PublicSupportTotal509Amt>
      <GrossInvestmentIncome509Grp>
        <CurrentTaxYearMinus4YearsAmt>29301</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>23053</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>23986</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>24006</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>32784</CurrentTaxYearAmt>
        <TotalAmt>133130</TotalAmt>
      </GrossInvestmentIncome509Grp>
      <InvestmentIncomeAndUBTIGrp>
        <CurrentTaxYearMinus4YearsAmt>29301</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>23053</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>23986</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>24006</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>32784</CurrentTaxYearAmt>
        <TotalAmt>133130</TotalAmt>
      </InvestmentIncomeAndUBTIGrp>
      <TotalSupportCalendarYearGrp>
        <CurrentTaxYearMinus4YearsAmt>483572</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>105553</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>525625</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>626131</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>767928</CurrentTaxYearAmt>
        <TotalAmt>2508809</TotalAmt>
      </TotalSupportCalendarYearGrp>
      <PublicSupportCY509Pct>0.92970</PublicSupportCY509Pct>
      <PublicSupportPY509Pct>0.92190</PublicSupportPY509Pct>
      <InvestmentIncomeCYPct>0.05310</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.05660</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="RetDoc1234500001">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MEMBERS OF THE ACADEMY SHALL BE PHYSICIANS IN GOOD PROFESSIONAL STANDING WHO LIMIT THEIR MEDICAL PRACTICE TO NEUROLOGICAL SURGERY. THE MEMBERSHIP OF THE ACADEMY SHALL BE CLASSIFIED AS ACTIVE, SENIOR, CORRESPONDING, SENIOR CORRESPONDING, HONORARY, AND INACTIVE. THESE CLASSES SHALL BE DEFINED AS FOLLOWS: ACTIVE MEMBERS SHALL BE ACTIVELY ENGAGED IN THE PRACTICE OF NEUROLOGICAL SURGERY. ACTIVE MEMBERS SHALL AUTOMATICALLY BECOME SENIOR MEMBERS AFTER TWENTY YEARS OF ACTIVE MEMBERSHIP OR UPON ATTAINING THE AGE OF SIXTY YEARS AFTER TEN YEARS OF ACTIVE MEMBERSHIP, WHICHEVER OCCURS FIRST. CORRESPONDING MEMBERS SHALL INCLUDE PHYSICIANS WHO ARE ELIGIBLE FOR ACTIVE MEMBERSHIP BUT WHO, BECAUSE OF GEOGRAPHIC LOCATION, CANNOT REGULARLY ATTEND ANNUAL MEETINGS. SENIOR CORRESPONDING MEMBERS SHALL INCLUDE ALL CORRESPONDING MEMBERS WHO HAVE ATTAINED THE AGE OF SIXTY YEARS. HONORARY MEMBERS SHALL BE DISTINGUISHED PHYSICIANS DEEMED WORTHY BY THE ACADEMY OF SUCH STATUS, FOLLOWING THE ELECTION PROCESS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>OFFICERS ARE ELECTED BY MEMBERSHIP AT EACH ANNUAL MEETING AND TAKE OFFICE AT THE CLOSE OF THAT MEETING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ARTICLES OF THE CONSTITUTION &amp; BYLAWS MAY BE AMENDED BY A THREE-FOURTH'S AFFIRMATIVE VOTE OF THE ACTIVE AND SENIOR MEMBERS PRESENT AND VOTING AT ANY STATED MEETING, PROVIDED DUE NOTICE OF ALL PROPOSED CHANGES HAVE BEEN SENT TO ALL MEMBERS AT LEAST TWO MONTHS BEFORE SAID MEETING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>AN ELECTRONIC COPY OF THE FORM 990 IS PROVIDED TO THE BOARD PRIOR TO FILING WITH THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>FINANCIAL STATEMENTS AND GOVERNING DOCUMENTS ARE AVAILABLE UPON REQUEST FOR THE SAME PERIOD OF DISCLOSURE AS SET FORTH IN SECTION 6104(D).</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
