Professor Brian Lepard delivered a paper on “The Necessity of Opinio Juris in the Formation of Customary International Law” at a conference on “The Role of Opinio Juris in Customary International Law” held at the University of Geneva. The conference was sponsored by the Duke-Geneva Institute in Transnational Law and the American Society of International Law. It brought together scholars and members of the U.N.’s International Law Commission to discuss how to identify and apply customary international legal norms. Lepard is currently working on editing a volume of essays on customary law entitled “Reexamining Customary International Law.”