He served as a long time trustee of the Aspen Institute (and long time executive board member), the Chesapeake Bay Foundation, the Johns Hopkins University, and Cornell University. He was Chairman of the Center for Strategic and Budgetary Assessments (CSBA) and a U.S. Director of the International Institute of Strategic Studies (IISS). He also served on the Department of Defense Business Board, the University of Maryland Board of Visitors, Johns Hopkins School of Advanced International Studies (SAIS) board, the Smithsonian's National Museum of American History board, the Foundation for the National Archives, and the Advanced Physics Laboratories board.