1959, AB, Bates College; 1965, PhD, Massachusetts Institute of Technology. Formerly, with University of Chicago. Since 1972, with The Wharton School: 1977-80, Chairperson, Decision Sciences Department; 1984-85 and 1999-2001; Co-Director, Center for Risk Management and Decision Processes; since 1994, current position; concurrently, Research Associate, National Bureau of Economic Research. Fellow, American Association of the Advancement of Science. Member, National Academy of Sciences: Adapting to the Impacts of Climate Change; Steering Committee, Adapting to Climate Change, Resources for the Future.