PhD, International Law, Université Libre de Bruxelles (ULB). Professor of Public International Law, International Law Methodology, Law of Peace and International Security, and Legal Sociology at the Faculty of Law of ULB. Associate member of the Institut de Droit International. He taught in several Universities around the world (France, Germany, Spain, Italy, Brazil), at the UN and at the Hague Academy of International Law. Diretor of the Revue Belge de Droit International. Counsel before the International Court of Justice in several cases. Several publications in international law.