Bachelor, University Melbourne, Australia, 1945. Master of Arts, University Melbourne, Australia, 1947. Doctor of Philosophy, Oxford (England) University, 1952.
Assistant lecturer philosophy, U. Melbourne, 1945-1947; lecturer, U. Melbourne, 1947-1949, 53-55; senior lecturer, U. Melbourne, 1955-1956; foundation professor, Canberra (Australia) U. College (ANU), 1957-1962; department chairman philosophy, U. Pittsburgh, 1962-1967; professor philosophy, U. Pittsburgh, 1967-1980; distinguished service professor, U. Pittsburgh, since 1980.
Married Annette Claire Stoop, December 28, 1958.