Larry May is a Professor of Philosophy at Washington University in St Louis and Strategic Research Professor of Social Justice at the Centre for Applied Philosophy and Public Ethics at Charles Sturt University in Canberra. He is the author or editor of more than 70 articles and more than 20 books, including The Morality of War; Crimes against Humanity: A Normative Account, which won a best book prize from the North American Society for Social Philosophy and an honorable mention from the American Society of International Law; War Crimes and Just War, which won the Frank Chapman Sharp Prize for best book on the philosophy of war and peace by the American Philosophical Association; Aggression and Crimes Against Peace, which won a best book prize from the International Association of Penal Law; and Genocide: A Normative Account. Zachary Hoskins is a doctoral candidate at Washington University in St Louis. He is the author of 'On Highest Authority: Do Religious Reasons Have a Place in Public Policy Debates', published in Social Theory and Practice (2009).