Geir Ulfstein is Professor of International Law at the Department of Public and International Law, Universitetet i Oslo and Co-Director of PluriCourts - Centre for the Study of the Legitimate Roles of the Judiciary in the Global Order, University of Oslo. He has been Director of the Norwegian Centre for Human Rights, Universitetet i Oslo (2004–8). Ulfstein is co-editor of UN Human Rights Treaty Bodies: Law and Legitimacy (Cambridge, 2012) and Making Treaties Work: Human Rights, Environment and Arms Control (Cambridge, 2007), and co-author of The Constitutionalization of International Law (2009).