Jann Kleffner is Assistant Professor of International Law at the University of Amsterdam Centre for International Law. He has co-authored Internationalized Criminal Courts and Tribunals: Sierra Leone, East Timor, Kosovo, and Cambodia with Andre Nollkaemper and Cesare Romano, (OUP, 2004). Jann K. Kleffner studied law in Germany, the UK and The Netherlands. He obtained his LL.M. and PhD degrees from the University of Amsterdam, where he currently holds a position as Assistant Professor of International Law. His main research and teaching activities are in the fields of international criminal law and the laws of armed conflict. He is Managing Editor of the Yearbook of International Humanitarian Law and holds a number of other appointments, including as Member of the Committee on compensation for victims of war of the International Law Association and as Visiting Lecturer at the Netherlands Defense Academy. Previously, he also served as a Member of the Informal Expert Group consulting the Prosecutor of the International Criminal Court on Complementarity in Practice and as General Rapporteur on the "Compatibility of national legal systems with the Statute of the Permanent International Criminal Court (ICC)" for the International Society of Military Law and the Law of War.