Immediately prior to joining RFF, Morgenstern was senior economic counselor to the undersecretary for global affairs at the U.S. Department of State, where he participated in negotiations for the Kyoto Protocol. Previously he served at the U.S. Environmental Protection Agency, where he acted as deputy administrator (1993); assistant administrator for policy, planning, and evaluation (1991-93); and director of the Office of Policy Analysis (1983-95). Formerly a tenured professor at the City University of New York, Morgenstern has taught recently at Oberlin College, the Wharton School of the University of Pennsylvania, Yeshiva University, and American University. He has served on expert committees of the National Academy of Sciences and as a consultant to various organizations.