Board directors, executive committee National Museum Natural History, Smithsonian, since 1992. Board directors Smithsonian National Board, 1999-2002. Trustee Aspen Music Festival and School, 1993-2003.
Chairman Arizona astronomy Board University Arizona, since 2003, mdm. dean's board College of Science, since 2004. Chairman Patton Boggs Foundation, since 2000. Member American Bar Association (past committee chairman), Inter-American Bar Association (past delegate), International Law Association (past committee chairman), American Society International Law (treasurer, executive council), Washington Institute Foreign Affairs, National Gallery (collectors committee 1988-1991), Gerrard Society, Metropolitan Club (Washington), Phi Beta Kappa, Alpha Epsilon Delta.