Campbell Craig is a professor of international politics at Aberystwyth University, where he writes and teaches on nuclear and cold war history and contemporary international relations theory. His most recent book, co-authored with Fredrik Logevall, is America's Cold War: the Politics of Insecurity. His article “The Resurgent Idea of World Government” appeared in Ethics & International Affairs in 2008. hoc@aber.ac.uk

J. Bryan Hehir is the Montgomery Professor of the Practice of Religion and Public Life at the Harvard Kennedy School of Government and is also the Secretary for Health Care and Social Services at the Archdiocese of Boston. Previously he served for 19 years at the US Conference of Catholic Bishops and taught at the Georgetown University School of Foreign Service. ReverendBryan_Hehir@rcab.org

Jacques E. C. Hymans is an associate professor in the School of International Relations at the University of Southern California. His first book, The Psychology of Nuclear Proliferation: Identity, Emotions, and Foreign Policy (2006), received the Edgar S. Furniss Award for the best first book in international security studies and the Alexander L. George Award for the best book in political psychology. His second book, Achieving Nuclear Ambitions: Scientists, Politicians, and Proliferation, was published by Cambridge University Press in 2012. Hymans has published articles in such journals as Foreign Affairs, International Security, and Security Studies, and he is a member of the editorial board of The Nonproliferation Review. hymans@usc.edu

Jan Ruzicka is a lecturer in security studies in the Department of International Politics at Aberystwyth University, where from 2009 to 2011 he worked as research assistant on the RCUK-funded project “Challenges to Trust-Building in Nuclear Worlds.” His articles on nuclear proliferation have been published in International Affairs, Royal United Services Institute Journal, and Medicine, Conflict and Survival. His current research explores the implications of nuclear weapons, trusting relationships, and revolutions for international security. jlr@aber.ac.uk

Richard Schiffman is a journalist and poet and the author of two books on the Hindu tradition. His work has appeared in the Washington Post, NPR, the Atlantic (online), the New York Times, and other publications, and he regularly contributes stories on the environment to the Guardian. richschiff@earthlink.net

Nina Tannenwald is a Faculty Fellow at the Watson Institute for International Studies at Brown University and a senior lecturer in the Political Science Department. Her teaching and research interests lie in the areas of international institutions and norms in security issues. Her book, The Nuclear Taboo: The United States and the Non-Use of Nuclear Weapons Since 1945, was awarded the Lepgold Prize for the best book in international relations in 2009. In 2012–2013 she served as a Franklin Fellow in the Office of Multilateral Nuclear and Security Affairs in the U.S. State Department. nina_tannenwald@brown.edu

Ward Wilson is a nuclear weapons policy analyst who poses fundamental challenges to the rationale for keeping nuclear weapons, using pragmatic arguments and reassessments of cold war evidence. A senior policy analyst at the British American Security Information Council, he is the author of Five Myths About Nuclear Weapons (2012). Wilson has contributed to The Bulletin of the Atomic Scientists, Joint Force Quarterly, the New York Times, and International Security, among others, and has spoken widely. ward@rethinkingnuclearweapons.org