- Chair, Syria Working Group, Hillary for America Presidential Campaign, 2016
- Member, Track Two Diplomacy Delegation, Russia and Syria, 2015-16
- Obama for America 2012 Presidential Campaign, Member, National Security Advisory Steering Committee and Co-Chair, Middle East Working Group
- Senior Advisor to the Director, State Department Policy Planning Staff, 2009-2011
- Member, Responsibility to Protect (R2P) Working Group, U.S. Institute of Peace and U.S. Memorial Holocaust Museum, Madeleine Albright and Rich Williamson (co-chairs), 2011-present
- Member, Expert Advisory Group on Preventive Diplomacy, National Bipartisan Genocide Prevention Task Force, 2008
- Member, Task Force on Iranian Nuclear Proliferation and Regional Security, Washington Institute for Near East Policy, 2008
- Project on U. S. Canadian Relations, Carleton University, Ottawa, Canada, 2008
- Strategic Leadership: Framework for a 21st Century National Security Strategy, A Phoenix Initiative Report, published by the Center for a New American Security, July 2008
- Foreign Policy Adviser (Foreign Policy Transition), Kerry – Edwards Campaign, 2004
- Senior Foreign Policy Advisor, Gore-Lieberman 2000 Campaign
- U.S. State Department, Policy Planning Staff, Special Assistant to the Director, 1993-1994
- Member, U.S. Delegation, Middle East Multilateral Arms Control and Regional Security (ACRS) Negotiations, 1993-1994
- Foreign Policy Advisor, Clinton-Gore Campaign, 1992
- Legislative Fellow for Foreign Affairs, Senator Al Gore, 1987-1988
- Legislative Aide for Foreign Affairs, Senator Dave Durenberger, 1978-1979
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