Sean D. Murphy is the Manatt/Ahn Professor of International Law at George Washington University in Washington, D.C. Since 2012, he has been a member of the U.N. International Law Commission, which appointed him special rapporteur for crimes against humanity. From 1987 to 1998, Professor Murphy was an attorney in the Office of the Legal Adviser at the U.S. Department of State, specializing in international claims and investment disputes, the law of war, and oceans and environmental law. He has served as an arbitrator, counsel, or expert in cases before international courts and tribunals, and during 2018-2020 he is the President of the American Society of International Law.