AB, Princeton (New Jersey) University, 1971. Doctor of Philosophy, University Pennsylvania, 1976. Doctor of Medicine, University Pennsylvania, 1977.
Resident in pediatrics, Childrens Hospital of Philadelphia, 1977-1979; assistant professor pediatrics, U. Toronto, Ontario, Canada, 1979-1983; scientist, Hospital for Sick Children, Toronto, 1979-1983; director of cellular immunology, Merck & Company, Rahway, New Jersey, 1983-1987; executive director immunology, Merck & Company, Rahway, New Jersey, 1987-1993; vice president biology, Pharmacapeia, Inc., Princeton, New Jersey, since 1994. Consultant Hospital for Sick Children, 1983-1985. Scientific advisory board Metamorphix, Boston, 1995.
Married Elaine C. Sigal, June 21, 1971. Children: Joshua, Yaron, Adam.