Mr. Walker serves as president and CEO of the Peterson Foundation. Prior to joining the Peterson Foundation, Mr. Walker served as the comptroller general of the United States and head of the U.S. Government Accountability Office (GAO). From 1989 to 1998, Mr. Walker was a partner and global managing director at Arthur Andersen LLP and served as a public trustee for Social Security and Medicare from 1990 to 1995. Before joining Arthur Andersen, Mr. Walker was assistant secretary of Labor for pension and welfare benefit programs and served as acting executive director of the Pension Benefit Guaranty Corporation. Mr. Walker is chairman of the Independent Audit Advisory Committee for the United Nations and a member of the Partnership for Public Service.