Bachelor of Arts, University of Michigan, 1949; Master of Arts, New School Social Research, 1952; Doctor of Philosophy, Princeton University, 1955; Bamford fellow, 1955-1956.
Instructor philosophy, Ohio State University, 1956-1959; assistant professor, Ohio State University, 1959-1960; associate professor philosophy, U. Maryland., College Park, 1960-1967; professor, U. Maryland., College Park, 1967-1997; professor emeritus, U. Maryland., College Park, since 1997.
Active American Civil Liberties Union. Served with Army of the United States, 1944-1946, PTO. Member American Association of University Professors, American Philosophical Association (executive director 1969-1972, secretary-treasurer Easterndiv. 1965-1968), Metaphys.
Society American, Washington Philosophy Club (pres.1978-1979), Washington Rare Book Group.
Married Eleanor Kudlich Berna, December 27, 1950. 1 child, Rachel.