U.S. Army Reserve private E2, 1961-1962
Private practice, New York City, 1962-1966
Assistant U.S. attorney, Southern District of New York, 1966-1969
Faculty, University of Colorado, 1969-1986; associate professor of law, 1969-1976; professor of law, 1976-1986
Visiting professor, University of California, Los Angeles, School of Law, 1975-1976
Visiting professor and fellow in law and economics, University of Chicago, 1979-1980
Visiting professor of energy law, Southern Methodist University School of Law, 1983-1984
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