AB, Columbia University, 1918; AM, Columbia University, 1919; Doctor of Philosophy, Columbia University, 1936.
Teacher ethics, Ethical Culture School, New York City, 1918-1928;
associate leader, Society Ethical Culture, 1927-1930;
with, Columbia University, 1920-1988;
successively lecturer philosophy, instructor, assistant professor, associate professor, Columbia University, 1920-1948;
professor philosophy, Columbia University, 1948-1962;
professor emeritus, Columbia University, 1962-1988;
department chairman, Columbia University, 1952-1961;
director university seminars, Columbia University, 1970-1975. Member Executive Committee Committee to Abolish Capital Punishment. Member East-West Philosophers Conference, U. Hawaii, 1969.
Representative American Civil Liberties Union at United Nations.
(Chicago 1936 1st Open Court. A translation of Schelling's...)
Board directors Encampment for Citizenship, chairman, 1973-1975. Board directors Conference on Methods in Philosophy and Sciences, Forum on Psychiatry and Humanities, Washington. Member American Association of University Professors, American Philosophical Association, Columbia Faculty Club, Phi Beta Kappa.
Married Jeanette Mack, February 3, 1920 (deceased 1960). Children: Barbara Rosenkrantz, Carl Mack, Alice Brandfonbrener. Married second Ruth Adler Friess, November 18, 1976 (deceased).