Peter J. Spiro holds the Charles Weiner Chair in international law.  Before joining Temple’s faculty in 2006, Professor Spiro was Rusk Professor of Law at the University of Georgia Law School, where he also served as Associate Dean for Faculty Development. A former law clerk to Justice David H. Souter of the U.S. Supreme Court, Spiro specializes in international, immigration, and constitutional law. Spiro is the author of Beyond Citizenship: American Identity After Globalization (Oxford University Press 2008) and At Home in Two Countries: The Past and Future of Dual Citizenship (NYU Press forthcoming spring 2016).

In a 2007 survey, Professor Spiro was ranked in the top 15 nationally among international law scholars on the basis of academic citation frequency. He has contributed commentary to such publications as  The New York Times, Foreign Affairs, The Wall Street Journal, and The New Republic,  and is frequently quoted in the media on international and immigration law issues.  He also writes for the leading international law blog, Opinio Juris.

In 1993-94, he served as a Council on Foreign Relations International Affairs Fellow, during which he studied the growing role of NGOs in international decision-making. Spiro was awarded an Open Society Institute/Soros Foundation fellowship to study the law of American citizenship in 1997-98. He served as a visiting professor at the University of Texas Law School in the spring of 2001, and was a professor of law at Hofstra University Law School, 1994-2004. Spiro is a frequent speaker in academic and policy forums on dual citizenship, the interaction of federal states with the international system and the role of non-governmental organizations in international institutions. He is a member of the U.S. Department of State’s Historical Advisory Committee.  In July 2011, he testified before the Senate Foreign Relations Committee on the application of the War Powers Act to U.S. participation in NATO operations in Libya.

In addition to his 1990-91 Supreme Court clerkship, Spiro served as a law clerk to Judge Stephen F. Williams of the U.S. Court of Appeals for the D.C. Circuit. He has also served as director for democracy on the staff of the National Security Council, as an attorney-adviser in the U.S. Department of State’s Office of the Legal Adviser and as a resident associate at the Carnegie Endowment for International Peace. Spiro holds a B.A. from Harvard College and a J.D. from the University of Virginia School of Law.


J.D., University of Virginia School of Law
B.A., Harvard University

Research & Teaching Areas

Areas of Expertise

Selected Publications

Publications and Media Appearances


  • Robert Schuman Fellow, European University Institute, Florence (spring 2016)
  • Member, Advisory Committee on Historical Diplomatic Documentation, U.S. Department of State (2008-12) (ASIL designate)
  • Project Scholar, Citizenship in the 21st Century, American Bar Association-American Library Association Public Education Program (2013-14)
  • Co-founder and Co-Chair, Migration Law Interest Group, American Society of International Law (2015- )
  • Member, Investment Migration Council (2014- )
  • Editorial Advisory Board, Citizenship and Migration in the Americas series, NYU Press (2010- )
  • Chair, AALS Section on Immigration Law (2006-07)