international organizations", George Washington International Law Review (2008); "The Secretary-General as norm entrepreneur," in Secretary or General? The Role of the UN Secretary-General in World Politics (2007); "The plea of necessity in international law: humanitarian intervention and counter-terrorism", Columbia Journal of Transnational Law (2005). From 2005-2007 he was the Volume Editor and Lead Scholar of the first two volumes of the Center on International Cooperation's Annual Review of Global Peace Operations. Professor Johnstone is a regular consultant to the United Nations on political, peacekeeping and related issues. A citizen of Canada but long-time resident of the US, he holds an LL.M degree from Columbia University and JD and BA degrees from the University of Toronto.