Managing Editor of Opinio Juris. Assistant Professor of Education in International and European Law at the University of Utrecht. Associate Fellow at the International Center for Counter-Terrorism–The Hague. Executive Board of Airwars. Previously, Lecturer at the University of Amsterdam, Project Officer at PAX and Researcher in human rights and international humanitarian law at T.M.C. Asser Instituut. Consultant, legal researcher and advocate on issues related to the use and proliferation of armed drones, use of force and targeted killing policies as well as national security, counterterrorism and human rights.