Geir Ulfstein is Professor of international law at the Department of Public and International Law, University of Oslo. He has been Director of the Norwegian Centre for Human Rights, University of Oslo (2004-2008). Ulfstein has published in different areas of international law, including the law of the sea, international environmental law, international human rights and international institutional law. He recently co-edited (with Helen Keller) UN Human Rights Treaty Bodies. Law and Legitimacy (CUP 2012), co-authored (with Jan Klabbers and Anne Peters) The Constitutionalization of International Law (OUP 2009) and was co-editor (with Thilo Marauhn and Andreas Zimmermann) of Making Treaties Work: Human Rights, Environment and Arms Control (CUP 2007). He is General Editor (with Andreas Føllesdal) of the new book series Studies on Human Rights Conventions (CUP). He is member of the Executive Board of the European Society of International Law.