The Hon. Helmut Sonnenfeldt (Hal Sonnenfeldt) is a Guest Scholar in Foreign Policy Studies at the Brookings Institution.
- Director, Office of Research on the Soviet Union and Eastern Europe, U.S. Department of State (1952-1969)
- Senior Staff Member, National Security Council (1969-1974)
- Counselor, U.S. Department of State (1974-1977)
- Member, Defense Policy Board Advisory Committee
- Member, American Committee for Peace in Chechnya
- Member, Committee for Peace and Security in the Gulf
- Member, Executive Committee, Balkan Action Committee
- Member, Executive Committee, International Institute for Strategic Studies (1988-1989)
- Member, Advisory Council, American Ditchley Foundation
- Member, Advisory Council, World Affairs Council, Washington, DC 
- Member, Advisory Council, The National Interest
- Visiting Scholar, Paul H. Nitze School of Advanced International Studies (SAIS) at Johns Hopkins University
- Member, Advisory Board for The European Institute
- Emeritus Trustee, Johns Hopkins University 
- Helmut Sonnenfeldt, Brookings Institution profile.