The Honorable William M. Diefenderfer, III
The Honorable William M. Diefenderfer, III is a founding member of the Diefenderfer Hoover law firm.
Mr. Diefenderfer has a wide range of expertise which includes the issue areas of trade, tax, housing, antitrust, insurance, finance, transportation, and telecommunications. In addition to his membership in the law firm, Mr. Diefenderfer currently serves on the Board of Directors of SLM Corp. (Sallie Mae) and is the Chairman of the Board of CubeSmart, L.P.
Mr. Diefenderfer has held a number of senior policy positions in the United States government that have contributed to his diverse background. Mr. Diefenderfer served as Deputy Director of the Office of Management and Budget. He was nominated to this position by President George H.W. Bush on January 18, 1989, and was subsequently confirmed by the U.S. Senate. The Office of Management and Budget (OMB) - part of the Executive Office of the President - assists the President of the United States in preparing and implementing the nation's budget, improving Federal management systems, reviewing Federal regulations, and developing procurement policy. Mr. Diefenderfer's duties generally paralleled those of the Director. Additionally, Mr. Diefenderfer served on the Deputies Committee of the National Security Council, Chairman of the President's Council of Management Improvement, and Chairman of the President's Council of Integrity and Efficiency. Before joining OMB, Mr. Diefenderfer was a partner with the law firm of Wunder, Diefenderfer, Sheinberg, & Hoover (now Diefenderfer Hoover McKenna & Wood, L.L.P.).
From January 1985 to October 1986, Mr. Diefenderfer served as Chief of Staff of the Senate Committee on Finance. In this capacity Mr. Diefenderfer was responsible for all legislative and nomination activities within the Committee's jurisdiction. That jurisdiction included bonded debt of the United States; customs, collection districts, and ports of entry and delivery; deposits of public monies; general revenue sharing; health programs under the Social Security Act and health programs financed by a specific tax or trust fund; national social security; reciprocal trade agreements; revenue measures generally and those relating to insular possessions; tariff and import quotas, and transportation of dutiable goods.
During Mr. Diefenderfer's tenure as Chief of Staff of the Senate Committee on Finance, the Tax Reform Act of 1986 was passed and signed into law by the President of the United States.
Prior to his appointment as Chief of Staff of the Senate Committee on Finance, he was a managing partner of the law firm McNair Glenn Konduros Corley Singletary Porter & Dibble, P.A. He joined that firm in April 1983.
From 1979 to 1983, Mr. Diefenderfer served as Chief Counsel of the Senate Committee on Commerce, Science, and Transportation. As such, Mr. Diefenderfer was responsible for all legislation and nominations within the Committee's jurisdiction. That jurisdiction encompassed, among others, the subject areas of communications, including telephone, radio, television and satellite communications; trade; surface transportation; merchant marine matters; aviation; science and space; and unfair trade practices.
While Chief Counsel of the Commerce Committee, Mr. Diefenderfer was a member of the official United States Trade Delegation which visited Japan, The Republic of South Korea, and The Peoples Republic of China.
Mr. Diefenderfer served as the Administrative Assistant/Legal Counsel to a New York Congressman from 1977 to 1979.
From 1975 to 1977, Mr. Diefenderfer served as Assistant Director of the White House Domestic Council during the Ford Administration and as Counsel to the House Committee on Education and Labor.
Mr. Diefenderfer served as the Regional Director of the Pennsylvania Higher Education Assistance Agency responsible for the State Scholarship and Loan Program in Southwest Pennsylvania from 1967 to 1970.
Mr. Diefenderfer holds a Masters of Law degree in International Trade Law and Common Market Law from Kings College, University of London. He received his J.D. degree from the Duquesne University School of Law in 1973 and his Bachelor of Arts degree from Dickinson College in 1967.
1988 - Diefenderfer Hoover, Washington, DC
1986 - Wunder & Diefenderfer, Washington, DC
1983 - The McNair Firm, Washington, DC
1974 - L.L.M. Kings College, University of London
1973 - J.D. Duquesne University School of Law
1967 - B.A. Dickinson College
District of Columbia
Commissioner, Commission on the Future of American Veterans – 2006 to 2009
Member, Standing Advisory Group , Public Company Accounting Oversight Board - 2004 - 2005
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