Bachelor summa cum laude, Yale University, 1963. Master of Arts, Harvard University, 1964. Doctor of Philosophy, Carnegie-Mellon University, 1968.
Assistant professor University California, Irvine, 1968-1970. Assoc professor University Texas, Austin, 1970-1978. Professor University Illinois, Chicago, 1978-1983.
Professor, chair artificial intelligence Free University Amsterdam, Netherlands, 1984-1991. Professor artificial intelligence University de Savoie, Chambéry, France, since 1991. Lecturer in field; visiting professor department mathematics Kuwait University, 1984, Istituto di Scienze dell'Informazione, U Torino, Italy, 1982, University Paris IX, 1981, many others.
Consultant in field.
Member Programme de Recherche Coordonnée-Intelligence Artificielle (board directors 1992-1997), Dutch Association Artificial Intelligence (board directors 1985-1991, president 1987-1990), European Coordinator Committee for Artificial Intelligence (board directors 1988-1992), Association Française Intelligence Artificielle (board directors since 1993, secretary 1994-1996), Hungarian Academy of Sciences (honorary).
Married Elinor Beidler, June 6, 1968 (divorced 1981). Children: Leif, Léon, Lyrna, Laurenne.