Outstanding Theoretical Publication Award 2025 (IACM)
2025 ISA-Midwest J. David Singer Book Award for When Peacekeeping Missions Collide (Oxford 2024)
Gregory Kersten Best Article in the Group Decision and Negotiation journal 2021
Rubin theory to practice award, 2018 (IACM)
Springer Best Paper Award, Group Decision and Negotiation, 2016
Best conference paper award, Novancia Paris, 2014
Outstanding Book Award, Evaluating Peace Operations (Lynne Reinner, 2012 ) (IACM)
L. Randolph Lowry Award, Southern California Mediation Association, 2009
Outstanding Book Award, Doing Research (Sage, 2006) (IACM)
Outstanding Article Award, Turning Points in International Negotiation, 2001 (IACM)
Teaching Excellence Award, George Mason University, 1998
Otto Klineberg Intercultural and International Relations Award, 1995 (Society for the Psychological Study of Social Issues)
Dissertation Best in Field 1966-67 (American Institute for Research)
Lifetime Achievement awards
- Informs, Group Decision and Negotiation, 2024
- Schar School for Policy and Government, George Mason University, 2022
- Albert Nelson Marquis Lifetime Achievement Award, 2019
- Novancia, Paris 2016
- International Association for Conflict Management, 2003