Dr. Cohen earned his B.A. from Harvard University in 1965. He holds two doctoral degrees from Harvard: a Ph.D. in applied mathematics (1970) and a doctorate of public health in population sciences and tropical public health (1973). He taught at Harvard from 1971 until his appointment as professor at Rockefeller in 1975. Dr. Cohen was a John D. and Catherine T. MacArthur Foundation Fellow and is a member of the National Academy of Sciences. He was a member of the board of trustees of the Population Reference Bureau and a member of the board of directors of The Nature Conservancy and cochair of its Science Council. He shared the Tyler Prize for Environmental Achievement from the University of Southern California in 1999 and the 1997 Fred L. Soper Award for Excellence in Public Health Literature from the Pan American Health and Education Foundation for his work on Chagas disease. Dr. Cohen is a faculty member in the David Rockefeller Graduate Program and the Tri-Institutional M.D.-Ph.D. Program.