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KPMG LLP Suite 12000 1801 K Street, NW Washington, DC 20006 Independent Auditors’ Report The Auditing Committee National Academy of Sciences: We have audited the accompanying statements of financial position of the National Academy of Sciences (NAS) as of December 31, 2011 and 2010, and the related statements of activities and cash flows for the years then ended. These financial statements are the responsibility of NAS’ management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits in accordance with auditing standards generally accepted in the United States of America. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of NAS’ internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of NAS as of December 31, 2011 and 2010, and its changes in net assets and its cash flows for the years then ended in conformity with U.S. generally accepted accounting principles. June 1, 2012 41 KPMG LLP is a Delaware limited liability partnership, the U.S. member firm of KPMG International Cooperative (“KPMG International”), a Swiss entity.