Professor Theo Farrell is Professor of War in the Modern World in the Department of War Studies at King’s College London. Professor Farrell is head of military studies research for the King’s War Studies Group.

He is associate editor of the leading US journal, Security Studies, and Chair of the International Security Studies Section (ISSS) of the International Studies Association (ISA). He is an expert on contemporary military operations, military innovation, strategic culture, and international law.

His recent books include The Sources of Military Change (2002), The Norms of War (2005), Force and Legitimacy in World Politics (2005), and International Law and International Relations (2007). He has held visiting fellowships at Trinity College Dublin, Stanford University and Johns Hopkins University. He is currently co-leading a large multinational project, funded by the Economic and Social Research Council (UK), on military transformation in NATO member states.