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Dr. William Sullivan awarded diploma of the Hague Academy of International Law cum laude

News 26th August 2025

Dr. William Sullivan has been awarded the Diploma of the Hague Academy of International Law, cum laude. The diploma is a high-level credential, awarded by the Hague Academy of International Law after a notoriously difficult written and oral examination, that recognizes demonstrated mastery of public or private international law. Past recipients of the diploma include former judges of the International Court of Justice, a number of prominent professors of international law, and several leading international arbitrators. Will received the diploma with the additional cum laude distinction, the Academy’s highest honor, at a ceremony in the Hague following examination by a jury comprising Professors Jean‑Marc Thouvenin, Burkhard Hess, Anatol Dutta, and Felipe Albuquerque.

Will is only the second person to receive the diploma in private international law cum laude in the last twenty-five years and one of only a handful of recipients since the Second World War.

ABOUT WILLIAM SULLIVAN

Will is an associate in the Washington, DC office. He has advised clients in the energy, finance, food, manufacturing, software, and telecommunications sectors in treaty and international commercial arbitrations conducted under AAA, ICC, ICSID, JAMS, LCIA, and UNCITRAL rules as well as in enforcement proceedings in United States courts.

Will studied classics at Princeton, law at Yale, and legal history at the University of Chicago, where he received a PhD. Immediately before joining Three Crowns, Will held the Raoul Berger-Mark DeWolfe Howe Fellowship at Harvard Law School and taught Roman law at Boston College Law School. He previously served as a law clerk for Judge José A. Cabranes of the United States Court of Appeals for the Second Circuit and, before graduate school, taught classical languages at Phillips Exeter Academy in Exeter, NH.