People: SLM Corp (SLM.O)

Mr. William M. Diefenderfer is an Independent Director of SLM Corp., since May 20, 1999. He has been Partner, Diefenderfer, Hoover, Boyle & Wood, a law firm, Pittsburgh, PA—1991 to present. He is director of Chairman of the Board, Cubesmart Real Estate Investment Trust. He is Chief Executive Officer and President, Enumerate Solutions, Inc., a privately owned technology company—2000 to 2002. He is Member, Public Company Accounting Oversight Board (PCAOB) Standing Advisory Group—2004-2005. He is Deputy Director, U.S. Office of Management and Budget—1989-1991.