Organization Institute for Defense Analysis

Peace Corps

Brookings Institution

Johns Hopkins University

Council on Foreign Relations

International Institute for Strategic Studies

Congressional Budget Office, analyst, (1989-1994)

Princeton University

Central Intelligence Agency

National Security Council

State Department of the United States

Woodrow Wilson International Center for Scholars

Institute for Energy Analysis

University of Maryland

Apollo Lunar Program (Advisory Committee)

Columbia University

Massachusetts Institute of Technology

University of California, Berkeley

Bell Labs

American Academy for the Advancement of Science

Russian Academy of Sciences

Naitonal Academy of Science

American Physical Society

United Church of Christ

National Academy of Sciences (1962)