John R. Crook teaches international arbitration at George Washington University Law School and is currently chairing an ad hoc UNCITRAL arbitration. His arbitral experience includes service as an arbitrator under NAFTA and as a Commissioner on the Eritrea-Ethiopia Claims Commission, which successfully addressed extensive claims following the two countries' 1998-2000 war. He is a frequent consultant to counsel in ICSID and other proceedings. Crook served for nearly three decades in the U.S.
State Department's Office of the Legal Adviser and was the second U.S. Agent at the Iran-U.S. Claims Tribunal in The Hague. He was deeply involved in creating the UN Compensation Commission in Geneva, and appeared in several cases before the International Court of Justice. From 2000-2004, he was General Counsel of the Multinational Force and Observers, an international organization operating an 1800-soldier peacekeeping force in the Sinai Desert in Egypt.
Crook edits the American Journal of International Law's section on Contemporary U.S. Practice Relating to International Law and has written extensively on dispute settlement. He is vice-president of the American Society of International Law.