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*The Role of Opinio Juris* in Customary International Law Duke-Geneva Institute in Transnational Law University of Geneva** July 12-13, 2013 Co-Sponsored by the American Society of International Law University of Geneva Law Faculty Building Uni Mail, 40 Boulevard du Pont d'Arve, CH-1211, Geneve 4
*Friday, July 12*
3:00 - 4:10 pm	*Panel 1: Historical Origins of the Opinio Juris* Requirement**
	Curtis Bradley, Duke Law School, The Chronological Paradox, State Preferences, and Opinio Juris J. Patrick Kelly, Widener School of Law, Opinio Juris in Historical Context Stephen Neff, Edinburgh Law School, Opinio Juris: Three Concepts Chasing a Label Commentator: Marie Jacobsson, Swedish Ministry for Foreign Affairs; member of International Law Commission
4:10 - 4:20 pm	Coffee Break
4:20 - 5:30 pm	*Panel 2: Does Customary International Law Need Opinio Juris?*
	Jörg Kammerhofer, University of Freiburg, Customary International Law Needs both Opinio and Usus Brian Lepard, University of Nebraska College of Law, The Necessity of Opinio Juris in the Formation of Customary International Law Maurice Mendelson QC, Blackstone Chambers, Does Customary International Law Require Opinio Juris? Commentator: Michael Wood, 20 Essex Street; member of International Law Commission
5:30 - 6:30 pm	Reception
7:30 - 9:30 pm	Dinner for Participants

*Saturday, July 13*
9:00 - 9:30 am	Continental Breakfast
9:30 - 10:40 am	*Panel 3: What Counts as Evidence of Opinio Juris?*
	Olufemi Elias, World Bank Administrative Tribunal & Chin Lim, University of Hong Kong, Proving Opinio Juris, and Customary International Law Laurence Helfer, Duke Law School & Timothy Meyer, University of Georgia Law School, Codifying Immunity or Fighting for Accountability? International Custom and the Battle Over Foreign Official Immunity in the United Nations Ingrid Wuerth, Vanderbilt Law School, National Court Decisions and Opinio Juris Commentator: Sean Murphy, George Washington University School of Law; member of the International Law Commission
10:40 - 10:50 am	Coffee Break
10:50 am – 12:00 pm	Panel 4: Treaty Regimes and Opinio Juris
	Joost Pauwelyn, The Graduate Institute, Treaty Regimes and Opinio Juris Monica Hakimi, University of Michigan School of Law, Law and the Universal Human Rights Treaties Richard Schmalbeck, Duke University School of Law, Opinio Juris in International Tax Commentator: Georg Nolte, Humboldt University of Berlin; member of the International Law Commission
12:00 - 1:30 pm	Lunch
1:30 – 2:40 pm	*Panel 5: Relationship Between Opinio Juris* and State Consent**
	Andrew Guzman, University of California, Berkeley School of Law, CIL and Non-Consensual Law Niels Peterson, Max Planck Institute, Customary Law, Consent, and the Status Quo Paradox John Tasioulas, University College London, Faculty of Laws, Custom and Consent Commentator: Jan Wouters, Katholieke Universiteit Leuven
2:40 - 2:50 pm	Coffee Break
2:50 - 4:00 pm	*Panel 6: Is Opinio Juris* a Unitary Phenomenon?**
	Noora Arajarvi, University of Central Lancashire, Cyprus, Changing Customary International Law and the Fluid Nature of Opinio Juris Mitu Gulati, Duke Law School, How do Courts Find International Custom? Emmanuel Voyiakis, London School of Economics, Rethinking the Normative Force of Customary International Law Commentator: Catherine Kessedjian, University of Pantheon-Assas, Paris II

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