Pierre d’Argent is full professor at the University of Louvain in Belgium, where he holds the Public International Law Chair. He is also a guest professor at Leiden University in the Netherlands. He is Associate Member of the Institut de droit international and member of the Brussels Bar, acting as special counsel to Foley Hoag LLP. He specializes in advising and representing states before international courts and tribunals. He appeared as counsel before the International Court of Justice and later served the court as first secretary.
He has published extensively in matters relating to international law and has lectured in many universities around the world. He has been director of studies at the Hague Academy of International Law and has taught a specialized course at the Academy. He has contributed to the UN Audiovisual Library of International Law.