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        <PersonNm>Jun Nishioka</PersonNm>
        <TitleTxt>Council</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Ms Allison Miller</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Susan Banahan</PersonNm>
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        <OfficerInd>X</OfficerInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Dr Ellen Kappel</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
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            <AddressLine1Txt>5610 Gloster Road</AddressLine1Txt>
            <CityNm>Bethesda</CityNm>
            <StateAbbreviationCd>MD</StateAbbreviationCd>
            <ZIPCd>20816</ZIPCd>
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        <CompensationAmt>114125</CompensationAmt>
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        <ExclusionAmt>0</ExclusionAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
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        <BusinessCd>813920</BusinessCd>
        <TotalRevenueColumnAmt>47598</TotalRevenueColumnAmt>
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        <ExclusionAmt>0</ExclusionAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
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        <TotalRevenueColumnAmt>9200</TotalRevenueColumnAmt>
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        <ExclusionAmt>0</ExclusionAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
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        <TotalRevenueColumnAmt>7335</TotalRevenueColumnAmt>
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        <ExclusionAmt>0</ExclusionAmt>
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        <ExplanationTxt>Other Income Part III, Line 12 Description: MISCELLANEOUS INCOME 2018: 7039. 2019: 2066. 2020: 2298. 2021: 1965. 2022: 2691.</ExplanationTxt>
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          <AddressLine2>RESTRICTED</AddressLine2>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt X, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>TOS is a nonprofit entity and is exempt from federal income taxes under Section 501(c)(3) of the Internal Revenue Code. Therefore, contributions to TOS are tax deductible under Section 170 of the Internal Revenue Code. TOS files an IRS Form 990-T to report all unrelated business income annually. TOS's unrelated business income arises from the sale of advertising in TOS's magazine. No liability related to unrelated business income tax is recorded in these financial statements as Management believes no such material liability exists. TOS is not classified as a private foundation by the Internal Revenue Service. TOS follows the recommendations of the Financial Accounting Standards Board (FASB) in its Accounting Standards Codification (ASC) for Accounting of Uncertainty in Income Taxes. Income tax benefits are recognized for income tax positions taken or expected to be taken in a tax return, only when it is determined that the income tax position will more-likely-than-not be sustained upon examination by taxing authorities. TOS has analyzed tax positions taken for filing with the Internal Revenue Service and all state jurisdictions where it operates. Management believes that income tax filing positions will be sustained upon examination and does not anticipate any adjustments that would result in a material adverse effect on TOS's financial condition, results of operations or cash flows. Accordingly, TOS has not recorded any reserves, or related accruals for interest and penalties for uncertain income tax positions at September 30, 2023. With few exceptions, TOS's returns remain open for three years for federal and state examination.</ExplanationTxt>
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          <BusinessName>
            <BusinessNameLine1Txt>Geosciences Professional Services Inc</BusinessNameLine1Txt>
          </BusinessName>
        </NameOfInterested>
        <RelationshipDescriptionTxt>Vendor/Council member</RelationshipDescriptionTxt>
        <TransactionAmt>151490</TransactionAmt>
        <TransactionDesc>Magazine editing fee</TransactionDesc>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization has four classes of members: regular, student, corporate, and institutional and associate.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>The regular and student members are eligible to vote for members of the Board and amendments to TOS'S By-Laws.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 7b</FormAndLineReferenceDesc>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>Each member of the Council will be provided a copy of this Form 990 and will have sufficient time to review and offer any changes.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Each Council member shall annually sign a statement which affirms that such Councillor has received a copy of the conflict of interest policy, has read and understands the policy, has agreed to comply with the policy, has disclosed all disclosable interest existing on or before the date of the statement, and understands that TOS is a charitable organization and that in order to maintain its federal tax exemption it must engage primarily in activities which accomplish one or more of its tax-exempt purposes.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>A published salary survey of Washington, DC area non-profit organizations was obtained, and a spreadsheet comparing compensation for equivalent Executive Director duties at TOS with comparably sized organizations was prepared when the compensation of the Executive Director was originally established. At that time, the results were reviewed by the president on behalf of the Council.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>Copies of all Forms 990 that have been filed, the annual audited financial statements and other governing policies are kept in TOS's office and are available for review upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>GRANTS CONTRACTOR 1953. 388. 1532. 33.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>EDITING 142015. 142015. 0. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>DESIGN 69352. 69352. 0. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>ASSISTANT EDITING 15401. 15401. 0. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
