Bachelor, Dartmouth College, 1964. Doctor of Philosophy, University Göttingen, 1970.
Assistant professor history State University of New York Buffalo, 1968-1972, associate professor history, 1972-1974. Director Institute European Environmental Policy, Bonn, Paris, London, 1970-1984. Senior fellow World Wildlife Foundation, Washington, 1984-1999, International Institute Sustainable Development, Winnipeg, Manitoba, Canada, from 1994.
Director collegiate assembly State University of New York Buffalo, 1970-1972. Adjunct professor environmental studies Dartmouth College, Hanover, New Hampshire, since 1984. Visiting professor Institute Environmental Studies, Free University, Amsterdam, since 1996.
Children: Johannes, Dorothea, Daniel, Jakob.