2010 -: Senior Researcher, University of Oslo, Faculty of Law.
2010 -: Senior Researcher (Associated), PRIO.
2010 -: Visiting Fellow, Hoover Institution, Stanford University.
2010 -: Visiting Professor, Georgetown University.
2010 April-May: Visiting Scholar in the University of California, Berkeley.
2006-2009: Senior Researcher, PRIO.
2003-05: Senior Legal Adviser and Chief of the Legal Advisory Section, Office of the Prosecutor, International Criminal Court.
2002-03: Senior Legal Adviser and co-ordinator of the process to establish the Office of the Prosecutor of the International Criminal Court.
2002: Consultant-Member Advance Team of the International Criminal Court.
1996-2002: Expert adviser to the Preparatory Committee for the International Criminal Court, the Rome Diplomatic Conference for the International Criminal Court, and the Preparatory Commission of the International Criminal Court, representing the International Criminal Tribunal for the Former Yugoslavia (ICTY) in these negotiations; Acting Head of ICTY Delegation to the Rome Conference.
2000: Legal Adviser on special assignment, Office of the General Prosecutor of the United Nations Transitional Administration in East Timor.
1994-2002: Legal Adviser, Office of the Prosecutor, International Criminal Tribunal for the Former Yugoslavia.
1993-94: Legal Adviser, United Nations Commission of Experts established pursuant to Security Council resolution 780 (1992), seconded by the Norwegian Ministry for Foreign Affairs.
1991-93: Researcher, Norwegian Human Rights Institute.
2002-: Doctor of Philosophy in International Law (Ph.D.), Cambridge University, St. John’s College.
1983-91: Candidatus Juris, University of Oslo, Faculty of Law.
1984: Iranian studies, University of Copenhagen, Institute of Oriental Philology.