Ian Johnstone is a Professor of International Law at The Fletcher School of Law and Diplomacy at Tufts University. In addition to his faculty position, he has held senior administrative positions at the School, as Dean ad interim from 2018-2019 and Academic Dean from 2013-15. Prior to joining Fletcher in the year 2000, Johnstone served in the United Nations’ Executive Office of the Secretary-General and the Department of Peacekeeping Operations. He continues to serve as an occasional consultant to the United Nations. His most recent books are Talking International Law: Legal Argumentation Beyond the Courtroom (Co-editor, Oxford University Press, forthcoming 2021); The Oxford Handbook on International Organizations (Co-editor, Oxford University Press, 2016); Law and Practice of the United Nations (Co-author 2nd edition, Oxford University Press, 2016); and The Power of Deliberation: International Law, Politics and Organizations (Oxford University Press, 2011). Johnstone is a member of the International Advisory Board of the International Peace Institute. He has been a Visiting Professor at University of Toronto Faculty of Law and the Munk School of Global Affairs, and at New York University’s School of Law. A citizen of Canada, he holds an LL.M degree from Columbia University and JD and B.A. degrees from the University of Toronto.