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It is an honor to deliver this Frankel Lecture, particularly in the company of two of my intellectual polestars: Thomas Franck of New York University School of Law and Robert Keohane of Duke University. These two scholars, and the academies they lead, represent the yin and the yang of my own education in international affairs. I first began studying international relations in 1972 as an undergraduate in the Harvard Government Department, in which Bob Keohane reigned for years as the benevolent hegemon. As a Justice Department lawyer in the 1980's, I cut my teeth on the very issues of public international law and the Constitution and foreign affairs upon which Tom Franck has been a leading commentator for decades.

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