Oliver P. Richmond is Research Professor of IR, Peace and Conflict Studies at the Humanitarian and Conflict Response Institute & Department of Politics, University of Manchester. His recent publications include Peace in IR (Routledge, 2008), Challenges to Peacebuilding: Managing Spoilers During Conflict Resolution (co-edited with Edward Newman) (UNU Press, 2006), and The Transformation of Peace (Palgrave, 2005). Roger Mac Ginty is Professor at the School of Government and International Affairs, Durham University and Director of the Durham Security Institute.