Professor Dr Jan Wouters teaches international law and the law of international organizations at Leuven University, where he is the Director of the Leuven Centre for Global Governance Studies and Institute for International Law. Dr Steven Blockmans is senior research fellow in EU law and deputy head of research at the T.M.C. Asser Instituut, The Hague. Tom Ruys is research fellow of the Fund for Scientific Research Flanders (FWO-Vlaanderen) at the Institute for International Law and junior member of the Leuven Centre for Global Governance Studies, Leuven University.