Senior Researcher at the International Peace Research Institute (PRIO) since 1997, Former Head of Corporate Governance (2005-07) at Norges Bank Investment Management. He is Chief Editor of the Journal of Military Ethics and part-time Associate Professor at the Norwegian Defence University College. He has previously been a Fulbright fellow at Boston College, USA (1989-91), a Norwegian Research Council fellow at the University of Oslo (1992-97), a journal editor for the Norwegian political journal Tidens Tegn (1998-2000), member of the secretariat of the Norwegian Government Commission on Human Values (1998-2001), and a post-doc. fellow at the Ethics Program, the University of Oslo (2002-05). He has lectured and published widely on problems within moral philosophy, political philosophy, and the ethics of warfare. He has published a book on just war in Norwegian (Rettferdig krig; Aschehoug, 2003), and he has recently published Natural Law, Religion, and Rights (St. Augustine’s Press, 2007), based on his doctoral dissertation, and a Norwegian monograph on the virtue of moderation (Måtehold; Cappelen Damm, 2009). He is the co-editor, with Gregory Reichberg and Endre Begby, of The Ethics of War: Classic and Contemporary Readings (Blackwell, 2006), and, with Gregory Reichberg, of Ethics, Nationalism, and Just War (Catholic University of America Press, 2007). At PRIO he works on the ethics of war, historically and systematically, as well as on the relationship between religion and the use of armed force. He is also a lecturer at Bjørknes College, contributing to the Master's degree program jointly undertaken by PRIO, Bjørknes, and the Australian National University.