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        <NamePerson>Lawrence A Siff</NamePerson>
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        <NamePerson>Leslie E Greis</NamePerson>
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        <NamePerson>Malcolm L Sherman</NamePerson>
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        <NamePerson>Matthew D Shedd</NamePerson>
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        <NamePerson>Michael A Champa</NamePerson>
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        <NamePerson>Michael E Kolowich</NamePerson>
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        <NamePerson>Michael G Thonis</NamePerson>
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        <NamePerson>Richard M Burnes Jr</NamePerson>
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        <NamePerson>Vanu G Bose</NamePerson>
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        <NamePerson>Yet-Ming Chiang</NamePerson>
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        <NamePerson>Donald M Kaplan</NamePerson>
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        <NamePerson>Gwill E York</NamePerson>
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        <NamePerson>Ioannis N Miaoulis</NamePerson>
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        <NamePerson>Leo X Liu</NamePerson>
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        <NamePerson>Paul Egerman</NamePerson>
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        <NamePerson>Wayne M Kennard</NamePerson>
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      <NetIncomeFromFundraisingEvents>
        <TotalRevenueColumn>-178350</TotalRevenueColumn>
        <UnrelatedBusinessRevenue>0</UnrelatedBusinessRevenue>
        <ExclusionAmount>-178350</ExclusionAmount>
      </NetIncomeFromFundraisingEvents>
      <GrossIncomeGaming>0</GrossIncomeGaming>
      <GamingDirectExpenses>0</GamingDirectExpenses>
      <NetIncomeFromGaming>
        <TotalRevenueColumn>0</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>0</RelatedOrExemptFunctionIncome>
        <UnrelatedBusinessRevenue>0</UnrelatedBusinessRevenue>
        <ExclusionAmount>0</ExclusionAmount>
      </NetIncomeFromGaming>
      <GrossSalesOfInventory>1896111</GrossSalesOfInventory>
      <CostOfGoodsSold>1045118</CostOfGoodsSold>
      <NetIncomeOrLoss>
        <TotalRevenueColumn>850993</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>850993</RelatedOrExemptFunctionIncome>
        <UnrelatedBusinessRevenue>0</UnrelatedBusinessRevenue>
        <ExclusionAmount>0</ExclusionAmount>
      </NetIncomeOrLoss>
      <OtherRevenueMisc>
        <Description>Sponsorship</Description>
        <BusinessCode>900099</BusinessCode>
        <TotalRevenueColumn>1417927</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>0</RelatedOrExemptFunctionIncome>
        <UnrelatedBusinessRevenue>0</UnrelatedBusinessRevenue>
        <ExclusionAmount>1417927</ExclusionAmount>
      </OtherRevenueMisc>
      <OtherRevenueMisc>
        <Description>Ancillary services</Description>
        <BusinessCode>531120</BusinessCode>
        <TotalRevenueColumn>1287123</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>0</RelatedOrExemptFunctionIncome>
        <UnrelatedBusinessRevenue>377421</UnrelatedBusinessRevenue>
        <ExclusionAmount>909702</ExclusionAmount>
      </OtherRevenueMisc>
      <OtherRevenueMisc>
        <Description>Concession fees</Description>
        <BusinessCode>453220</BusinessCode>
        <TotalRevenueColumn>907526</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>0</RelatedOrExemptFunctionIncome>
        <UnrelatedBusinessRevenue>0</UnrelatedBusinessRevenue>
        <ExclusionAmount>907526</ExclusionAmount>
      </OtherRevenueMisc>
      <MiscellaneousRevenue>
        <TotalRevenueColumn>507099</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>0</RelatedOrExemptFunctionIncome>
        <UnrelatedBusinessRevenue>0</UnrelatedBusinessRevenue>
        <ExclusionAmount>507099</ExclusionAmount>
      </MiscellaneousRevenue>
      <TotalOtherRevenue>4119675</TotalOtherRevenue>
      <TotalRevenue>
        <TotalRevenueColumn>57007864</TotalRevenueColumn>
        <RelatedOrExemptFunctionIncome>17905718</RelatedOrExemptFunctionIncome>
        <UnrelatedBusinessRevenue>386073</UnrelatedBusinessRevenue>
        <ExclusionAmount>13544090</ExclusionAmount>
      </TotalRevenue>
      <GrantsToDomesticOrgs>
        <Total>3158342</Total>
        <ProgramServices>3158342</ProgramServices>
      </GrantsToDomesticOrgs>
      <GrantsToDomesticIndividuals>
        <Total>471597</Total>
        <ProgramServices>471597</ProgramServices>
      </GrantsToDomesticIndividuals>
      <ForeignGrants>
        <Total>78500</Total>
        <ProgramServices>78500</ProgramServices>
      </ForeignGrants>
      <BenefitsToMembers>
        <Total>0</Total>
        <ProgramServices>0</ProgramServices>
      </BenefitsToMembers>
      <CompCurrentOfficersDirectors>
        <Total>1582044</Total>
        <ProgramServices>416304</ProgramServices>
        <ManagementAndGeneral>702039</ManagementAndGeneral>
        <Fundraising>463701</Fundraising>
      </CompCurrentOfficersDirectors>
      <CompDisqualPersons>
        <Total>0</Total>
        <ProgramServices>0</ProgramServices>
        <ManagementAndGeneral>0</ManagementAndGeneral>
        <Fundraising>0</Fundraising>
      </CompDisqualPersons>
      <OtherSalariesAndWages>
        <Total>17870218</Total>
        <ProgramServices>13944523</ProgramServices>
        <ManagementAndGeneral>1495593</ManagementAndGeneral>
        <Fundraising>2430102</Fundraising>
      </OtherSalariesAndWages>
      <PensionPlanContributions>
        <Total>762766</Total>
        <ProgramServices>587373</ProgramServices>
        <ManagementAndGeneral>68153</ManagementAndGeneral>
        <Fundraising>107240</Fundraising>
      </PensionPlanContributions>
      <OtherEmployeeBenefits>
        <Total>2187549</Total>
        <ProgramServices>1684537</ProgramServices>
        <ManagementAndGeneral>195456</ManagementAndGeneral>
        <Fundraising>307556</Fundraising>
      </OtherEmployeeBenefits>
      <PayrollTaxes>
        <Total>1425841</Total>
        <ProgramServices>1097979</ProgramServices>
        <ManagementAndGeneral>127398</ManagementAndGeneral>
        <Fundraising>200464</Fundraising>
      </PayrollTaxes>
      <FeesForServicesManagement>
        <Total>0</Total>
        <ProgramServices>0</ProgramServices>
        <ManagementAndGeneral>0</ManagementAndGeneral>
        <Fundraising>0</Fundraising>
      </FeesForServicesManagement>
      <FeesForServicesLegal>
        <Total>25720</Total>
        <ProgramServices>0</ProgramServices>
        <ManagementAndGeneral>25720</ManagementAndGeneral>
        <Fundraising>0</Fundraising>
      </FeesForServicesLegal>
      <FeesForServicesAccounting>
        <Total>227517</Total>
        <ProgramServices>0</ProgramServices>
        <ManagementAndGeneral>227517</ManagementAndGeneral>
        <Fundraising>0</Fundraising>
      </FeesForServicesAccounting>
      <FeesForServicesLobbying>
        <Total>130314</Total>
        <ProgramServices>61998</ProgramServices>
        <ManagementAndGeneral>0</ManagementAndGeneral>
        <Fundraising>68316</Fundraising>
      </FeesForServicesLobbying>
      <FeesForServicesProfFundraising>
        <Total>240044</Total>
        <Fundraising>240044</Fundraising>
      </FeesForServicesProfFundraising>
      <FeesForServicesInvstMgmntFees>
        <Total>0</Total>
        <ProgramServices>0</ProgramServices>
        <ManagementAndGeneral>0</ManagementAndGeneral>
        <Fundraising>0</Fundraising>
      </FeesForServicesInvstMgmntFees>
      <FeesForServicesOther>
        <Total>3113369</Total>
        <ProgramServices>2595220</ProgramServices>
        <ManagementAndGeneral>201661</ManagementAndGeneral>
        <Fundraising>316488</Fundraising>
      </FeesForServicesOther>
      <Advertising>
        <Total>2507075</Total>
        <ProgramServices>2450580</ProgramServices>
        <ManagementAndGeneral>21081</ManagementAndGeneral>
        <Fundraising>35414</Fundraising>
      </Advertising>
      <OfficeExpenses>
        <Total>2552806</Total>
        <ProgramServices>1966243</ProgramServices>
        <ManagementAndGeneral>265641</ManagementAndGeneral>
        <Fundraising>320922</Fundraising>
      </OfficeExpenses>
      <InformationTechnology>
        <Total>399758</Total>
        <ProgramServices>254770</ProgramServices>
        <ManagementAndGeneral>97687</ManagementAndGeneral>
        <Fundraising>47301</Fundraising>
      </InformationTechnology>
      <Royalties>
        <Total>20424</Total>
        <ProgramServices>15753</ProgramServices>
        <ManagementAndGeneral>0</ManagementAndGeneral>
        <Fundraising>4671</Fundraising>
      </Royalties>
      <Occupancy>
        <Total>2505894</Total>
        <ProgramServices>2123283</ProgramServices>
        <ManagementAndGeneral>333112</ManagementAndGeneral>
        <Fundraising>49499</Fundraising>
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      <Travel>
        <Total>1525316</Total>
        <ProgramServices>1398484</ProgramServices>
        <ManagementAndGeneral>109183</ManagementAndGeneral>
        <Fundraising>17649</Fundraising>
      </Travel>
      <TravelEntrtnmntPublicOfficials>
        <Total>0</Total>
        <ProgramServices>0</ProgramServices>
        <ManagementAndGeneral>0</ManagementAndGeneral>
        <Fundraising>0</Fundraising>
      </TravelEntrtnmntPublicOfficials>
      <ConferencesMeetings>
        <Total>57216</Total>
        <ProgramServices>50067</ProgramServices>
        <ManagementAndGeneral>726</ManagementAndGeneral>
        <Fundraising>6423</Fundraising>
      </ConferencesMeetings>
      <Interest>
        <Total>178133</Total>
        <ProgramServices>0</ProgramServices>
        <ManagementAndGeneral>178133</ManagementAndGeneral>
        <Fundraising>0</Fundraising>
      </Interest>
      <PaymentsToAffiliates>
        <Total>0</Total>
        <ProgramServices>0</ProgramServices>
        <ManagementAndGeneral>0</ManagementAndGeneral>
        <Fundraising>0</Fundraising>
      </PaymentsToAffiliates>
      <DepreciationDepletion>
        <Total>4664997</Total>
        <ProgramServices>4221854</ProgramServices>
        <ManagementAndGeneral>375066</ManagementAndGeneral>
        <Fundraising>68077</Fundraising>
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      <Insurance>
        <Total>336391</Total>
        <ProgramServices>41624</ProgramServices>
        <ManagementAndGeneral>294767</ManagementAndGeneral>
        <Fundraising>0</Fundraising>
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      <OtherExpenses>
        <Description>Film and exhibit rental</Description>
        <Total>1101752</Total>
        <ProgramServices>1101752</ProgramServices>
        <ManagementAndGeneral>0</ManagementAndGeneral>
        <Fundraising>0</Fundraising>
      </OtherExpenses>
      <OtherExpenses>
        <Description>Catering</Description>
        <Total>623671</Total>
        <ProgramServices>391532</ProgramServices>
        <ManagementAndGeneral>50556</ManagementAndGeneral>
        <Fundraising>181583</Fundraising>
      </OtherExpenses>
      <OtherExpenses>
        <Description>Credit card handling fees</Description>
        <Total>446685</Total>
        <ProgramServices>433932</ProgramServices>
        <ManagementAndGeneral>26</ManagementAndGeneral>
        <Fundraising>12727</Fundraising>
      </OtherExpenses>
      <OtherExpenses>
        <Description>Taxes</Description>
        <Total>216210</Total>
        <ProgramServices>196044</ProgramServices>
        <ManagementAndGeneral>20166</ManagementAndGeneral>
        <Fundraising>0</Fundraising>
      </OtherExpenses>
      <OtherExpenses>
        <Description>Fundraising event expenses reclassed to Part VIII</Description>
        <Total>-264034</Total>
        <ProgramServices>0</ProgramServices>
        <ManagementAndGeneral>0</ManagementAndGeneral>
        <Fundraising>-264034</Fundraising>
      </OtherExpenses>
      <AllOtherExpenses>
        <Total>246499</Total>
        <ProgramServices>67242</ProgramServices>
        <ManagementAndGeneral>109863</ManagementAndGeneral>
        <Fundraising>69394</Fundraising>
      </AllOtherExpenses>
      <TotalFunctionalExpenses>
        <Total>48392614</Total>
        <ProgramServices>38809533</ProgramServices>
        <ManagementAndGeneral>4899544</ManagementAndGeneral>
        <Fundraising>4683537</Fundraising>
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      <CashNonInterestBearing>
        <BOY>12113896</BOY>
        <EOY>11581445</EOY>
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      <SavingsAndTempCashInvestments>
        <BOY>487865</BOY>
        <EOY>547782</EOY>
      </SavingsAndTempCashInvestments>
      <PledgesAndGrantsReceivable>
        <BOY>19083477</BOY>
        <EOY>15569530</EOY>
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      <AccountsReceivable>
        <BOY>635839</BOY>
        <EOY>1268917</EOY>
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      <ReceivablesFromOfficersEtc>
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        <EOY>1410</EOY>
      </ReceivablesFromOfficersEtc>
      <ReceivablesFromDisqualPersons>
        <BOY>0</BOY>
        <EOY>0</EOY>
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      <OtherNotesLoansReceivableNet>
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        <EOY>0</EOY>
      </OtherNotesLoansReceivableNet>
      <InventoriesForSaleOrUse>
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        <EOY>11500</EOY>
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      <PrepaidExpensesDeferredCharges>
        <BOY>1471871</BOY>
        <EOY>1318764</EOY>
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      <LandBldgEquipmentAccumDeprec>65178358</LandBldgEquipmentAccumDeprec>
      <LandBuildingsEquipmentBasisNet>
        <BOY>55877396</BOY>
        <EOY>61790804</EOY>
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        <EOY>16425711</EOY>
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        <BOY>78920895</BOY>
        <EOY>91318436</EOY>
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      <InvestmentsProgramRelated>
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        <EOY>0</EOY>
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        <EOY>0</EOY>
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        <EOY>260609</EOY>
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      <TotalAssets>
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      <AccountsPayableAccruedExpenses>
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      <GrantsPayable>
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      <DeferredRevenue>
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        <EOY>4588081</EOY>
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      <TaxExemptBondLiabilities>
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      <EscrowAccountLiability>
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      <LoansFromOfficersDirectors>
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        <EOY>0</EOY>
      </LoansFromOfficersDirectors>
      <MortNotesPyblSecuredInvestProp>
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        <EOY>3400682</EOY>
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        <EOY>0</EOY>
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        <BOY>5244022</BOY>
        <EOY>5163852</EOY>
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      <TotalLiabilities>
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        <EOY>17322476</EOY>
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      <FollowSFAS117>X</FollowSFAS117>
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        <EOY>182772432</EOY>
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      <AuditCommittee>1</AuditCommittee>
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      <FederalGrantAuditPerformed>1</FederalGrantAuditPerformed>
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        <CurrentTaxYearMinus1Year>0</CurrentTaxYearMinus1Year>
        <CurrentTaxYear>0</CurrentTaxYear>
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        <CurrentYearMinus2>208675</CurrentYearMinus2>
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        <CurrentYearMinus2>250000</CurrentYearMinus2>
        <CurrentYearMinus1>250000</CurrentYearMinus1>
        <CurrentYear>250000</CurrentYear>
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        <CurrentYearMinus2>0</CurrentYearMinus2>
        <CurrentYearMinus1>0</CurrentYearMinus1>
        <CurrentYear>0</CurrentYear>
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      <CollectUsedForPublicExhibition>X</CollectUsedForPublicExhibition>
      <CollectUsedForPreservation>X</CollectUsedForPreservation>
      <SolicitedAssetsForSale>0</SolicitedAssetsForSale>
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        <Explanation>The Museum's collections are used primarily for educational activities, encompassing interpretations, discovery spaces, exhibits, lectures, classes, demonstrations, reference service, or other programs. The Museum also has a historical and archival collection that documents the important and rich history of the institution. The Collections Department provides professional stewardship for artifacts that are temporarily in the custody of the Museum through loans and/or temporary exhibitions. Collections consist of: Natural Sciences - 20,000 items; Cultural/Physical Science - 5,000 items; Artwork - 2,000 items; Institutional History - 3,000 items; Archives - 300 linear feet. Live animals include: Butterfly Garden - approximately 300 butterflies representing 50 species, Other spaces - 120 either individual animals or colonies of live animals throughout the Museum presenting 50 species. Fifty of these are on exhibit and the rest live in the Live Animal Center.</Explanation>
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        <Explanation>The Museum's endowment includes both donor-restricted endowment funds and funds designated by the Board of Trustees to function as endowments ("quasi-endowments"). The endowment consists of 104 individual donor restricted endowment funds and 26 quasi-endowment funds for a variety of purposes including unrestricted general operating support. The relative principal uses of the endowment (as measured by fair value) include: Unrestricted/general - 33%, Exhibit construction and maintenance - 33%, Program support - 14%, Mixed use (primarily exhibits and programs jointly) - 15%, Other (including Library, Access, and Internships) - 5%</Explanation>
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        <Explanation>The Museum's footnote disclosure with respect to FIN 48 is as follows: "The Museum is exempt from income taxation under the provisions of Section 501(c)(3) of the Internal Revenue Code and is qualified to receive tax-deductible gifts and bequests under the U.S. tax code. The Museum is subject to tax on income from any business it conducts which is unrelated to its charitable purpose. U.S. GAAP requires the Museum to determine its tax positions based on a "more-likely-than-not" threshold applied to the likelihood that positions taken or exptected to be taken in a tax reutrn would be sustained upon examination by the relevant taxing authority. The Museum is subject to routine audits by several taxing jurisdictions; however, there are currently no audits for any tax periods in progress. The Museum believes it is no longer subject to income tax examinations for years prior to 2008."</Explanation>
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        <ReturnReference>Schedule D, Part XI, Line 8</ReturnReference>
        <Explanation>Amortization of liability: $205,140; Change in value of Split Interest agreements: $772,128; Capitalized bond fees: ($5,047); Total rounding variances: ($1,260)</Explanation>
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        <Explanation>Amortization of liability: $205,140; Change in value of split interests: $772,128; Rounding variances: ($1,677)</Explanation>
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        <Explanation>Fundraising expenses on Line 8b: ($264,034); Cost of goods sold on Line 10b: ($1,045,118)</Explanation>
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        <Explanation>Capitalized bond fees: $5,047; Fundraising expenses reported in Part VIII: $264,034; Cost of goods sold reported in Part VIII: $1,045,118; Loss on disposal of capital assets (see Part VIII): $58,767; Rounding variances: ($417)</Explanation>
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        <Explanation>GRANT-MAKING: Grant-making expenditures outside the United States are directly accounted for on the Museum's financial statements as program expenditures not distinguished in any way from similar grants made to recipients within the United States. SEMINARS, MEETINGS, AND CONFERENCES: As the Museum expands its programming internationally, staff are increasingly called upon to travel to meetings and conferences in other countries, and to visit peer institutions to review programs and exhibits which may potentially be added to the Museum's own offerings. Costs associated with such travel are accounted for under the same accountable plan as the Museum's domestic travel.</Explanation>
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        <Explanation>The Museum provides to its President and Director two forms of compensation not available to other employees. Due to the significant amount of travel undertaken by the President and Director on behalf of the Museum, travel costs for his wife are sometimes provided in cases where the travel is lengthy or the nature/purpose of a trip is such that accompaniment by a spouse is expected or customary. Amounts provided under this arrangement are reported on Form W-2 as appropriate. The Museum also provides college tuition, room, and board for the President and Director's children, grossing up the payments to offset the related tax obligations. These payments are included in Part II Column (B)(iii) Other reportable compensation.</Explanation>
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        <Explanation>During the fiscal year ended 6/30/09, the Museum suspended its usual policy of annual salary increases and froze salaries for the duration of the year in response to the global economic downturn. In July 2010, due to positive FY09 results all regular employees of the Museum who had been employed for longer than one year received a lump sum payment to compensate for the lack of FY09 increases. These payments were calculated based on a fixed percentage of base salary. The persons listed on Form 990, Part VII, Line 1a received these payments subject to the same conditions and calculations applied to all other Museum employees.</Explanation>
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        <NamePerson>Ioannis N Miaoulis</NamePerson>
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        <Explanation>The Museum does not engage in loans with interested persons per se; however, while on business travel, Officers or Key Employees may, in addtion to normal business expenses, charge items of a personal nature to the Museum credit card, resulting in amounts receivable by the Museum from the employee. These debts are usually discharged within 30 days. As of 6/30/2011, the Museum's President and Director had an outstanding balance from a recent trip in the amount of $1,409.79.</Explanation>
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        <Explanation>The Museum's Form 990 is prepared by the staff of the Accounting Department. It is then reviewed by the CFO and presented to the Audit Committee of the Museum's Board for further review. After the Audit Committee review, the final version of Form 990 is provided to all members of the Museum's Board before the form is filed.</Explanation>
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        <Explanation>Upon election/hiring, and annually thereafter, all Museum Trustees, Overseers (an advisory, but non-governing body), and Key Employees are required to fill out a detailed Conflict of Interest form which solicits detailed information about associations with companies, organizations, and each other which may represent a conflict of interest with respect to the Museum. The forms are reviewed at least annually by both the CFO and staff of the Museum's Accounting department to identify any reported conflicts which may require disclosure and/or further follow-up. With respect to business relationships with companies associated with Trustees or Key Employees, it is the Museum's policy to subject such companies to the same procurement policies, procedures, and requirements as other, nonrelated, firms.</Explanation>
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      <GeneralExplanation>
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        <ReturnReference>Form 990, Part VI, Section B, Line 15</ReturnReference>
        <Explanation>The Compensation Committee of the Museum's Board meets twice yearly, once in spring and once in the late summer or early fall. The first meeting is focused on establishing a recommendation to the Finance Committee that budgets for the upcoming fiscal year's museum-wide merit increase pool. The second meeting is focused on the review of the performance of Key Employees and other senior leadership staff for the prior year and to approve the recommendations of the President/Director for any salary increases. In addition, the Committee reviews the performance and compensation of the President/Director and recommends any adjustment to compensation if warranted. In order to do this in a fully knowledgeable manner, the Committee annually reviews information obtained by the Vice President of Human Resources though a variety of resources. These resources include an outside survey group used to benchmark each of the senior management positions including the President and Director against local non-profit organizations that are of a similar size. In addition, the Museum uses public resources such as Guidestar to access salaries of key people in Museums located in metropolitan areas. Finally, the Museum participates in and receives information from local and regional salary surveys of other Museums in New England. This process gives a clear picture of local, regional and national salary levels for its senior management. The Compensation Committee reviews this information in addition to the history of compensation increases, overall performance of the individual and of the Museum prior to approving or making recommendations for compensation increases.</Explanation>
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      <GeneralExplanation>
        <Identifier>F990_P06_S0C_L19</Identifier>
        <ReturnReference>Form 990, Part VI, Section C, Line 19</ReturnReference>
        <Explanation>The Museum's financial statements, Form 990, and other key documents are available in either hard copy or electronically upon request. Form 990 is also available through publicly accessible websites such as Guidestar.org. The audited financial statements are available on the Museum's website at http://www.mos.org/visitor_info/about_the_museum/financial_information</Explanation>
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      <GeneralExplanation>
        <Identifier>F990_P11_S00_L05</Identifier>
        <ReturnReference>Form 990, Part XI, Line 5</ReturnReference>
        <Explanation>Net unrealized gains: $6,692,789; Amortization of liability: $205,140; Change in value of Split Interest agreements: $772,128; Capitalized bond fees; ($5,047)</Explanation>
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