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After finishing his law degree at the Tulane University School of Law, Letten worked for Orleans Parish District Attorney Harry Connick, Sr. for four years and then began his career as a prosecutor for the U.S. Department of Justice.
Perry began his teaching career at Ohio State University College of Law (1975-82) and has taught as a visiting professor at several law schools, including Yale Law School, Tulane University School of Law, New York Law School, University of Tokyo, University of Alabama School of Law, and University of Western Ontario, Canada.