Harold Hongju Koh is Sterling Professor of International Law at Yale Law School where he has taught since 1985 and served as Dean from 2004-09. A graduate of Harvard, Magdalen College Oxford (BA, MA, PPE, Marshall Scholar), and Harvard Law School, he served as law clerk to Supreme Court Justice Harry A. Blackmun and Judge Malcolm Richard Wilkey of the DC Circuit, then served in the U.S. Government at the Justice Department and State Department. He has served four Presidents as Attorney-Adviser in the Office of Legal Counsel, US Department of Justice from 1983-85, Assistant Secretary of State for Democracy, Human Rights, and Labor from 1998-2001, Legal Adviser from 2009-13, and Senior Advisor in the Office of the Legal Adviser in 2021. A recipient of 17 honorary degrees, he is the author of 8 books and more than 200 articles, and is a member of the American Philosophical Society, the American Academy of Arts and Sciences, the Council of the American Law Institute, and a Counsellor of the American Society of International Law. He has been given lifetime achievement awards from Columbia Law School and the ABA International Law Section for his work in international law, and has received more than 30 awards for his human rights work. He is an Honorary Fellow of Magdalen College, Oxford, and has been Visiting Fellow at All Souls College, Oxford, Eastman Professor and Smithies Fellow at Balliol College, Oxford, and Goodhart Visiting Professor of Legal Science at the University of Cambridge. He has testified regularly before Congress and has argued frequently before U.S. and international tribunals, including most recently as Counsel for Ukraine against Russia before the International Court of Justice.