Director of the Norwegian Centre for Human Rights 2004-2007.  Visiting scholar at the University of Washington, University of Cambridge, Max Planck Institute for Comparative Public and International Law (Heidelberg), and University of Paris I – Panthéon Sorbonne.

Publications in various fields of international law, including the law of the sea, international environmental law, human rights, and international institutional law. Co-edited Making Treaties Work: Human Rights, Environment and Arms Control (CUP 2007) and co-authored (with Jan Klabbers and Anne Peters) The Constitutionalization of International Law (OUP 2009).

Co-director of a research project on “Should States Ratify Human Rights Conventions?” at the Norwegian Centre for Advanced Study (CAS) (2009-2010). The outcome will be published in a new book series: Studies on Human Rights Conventions (CUP).