Andrew Clapham is Professor of Public International Law at the Graduate Institute of International Studies, Geneva. Before he joined the GIIS in 1997, he was the Representative of Amnesty International to the United Nations in New York. His current research relates to the role of non-state actors in international law and related questions in human rights and humanitarian law. Andrew Clapham was the Director of the Geneva Academy of International Humanitarian Law and Human Rights from 2006 until 2014. His publications include The Oxford Handbook of International Law in Armed Conflict (co-edited with Paola Gaeta) (OUP 2014), Human Rights: A Very Short Introduction (2007), Human Rights Obligations of Non-State Actors (2006), and International Human Rights Lexicon (2005), with Susan Marks. He is an academic associate member of Matrix Chambers in London. Paola Gaeta (PhD in Law, European University Institute, 1997) was Assistant Professor (1998), Associate Professor (2001) and then Tenured Professor (2001-2010) of Public International Law at the University of Florence. She is currently Tenured Professor of International Criminal Law at the Law Faculty of the University of Geneva and Adjunct Professor of International Criminal Law at the Graduate Institute for International and Development Studies. From 2007 until 2014, she was the Director of the LL.M. Programme in International Humanitarian Law of the Geneva Academy of International Humanitarian Law and Human Rights and from 2011 until 2014 Director of the Academy itself. She is a Member of the Editorial Board of the Journal of International Criminal Justice and of the Editorial Board of the European Journal of International Law. Her publications include The Oxford Handbook of International Law in Armed Conflict (co-edited with Andrew Clapham) (OUP 2014). Marco Sassòli (PhD in Law, Basel, 1989) is Professor of International Law and Director of the Department of International Law and International Organization at the University of Geneva. From 2001-2003, Marco Sassòli was Professor of International Law at the Université du Québec à Montreal, Canada, where he remains Associate Professor. He is member of the International Commission of Jurists. He has worked from 1985-1997 for the International Committee of the Red Cross (ICRC) at the headquarters, inter alia as Deputy Head of its Legal Division, and in conflict areas, in particular the Middle East and the Balkans. He has also served as registrar at the Swiss Supreme Court, and from 2004-2013 as chair of the board of Geneva Call, an NGO engaging non-state armed actors to respect humanitarian rules.