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Columbia, A.B., 1931; M.A., 1933; Ph.D., 1944. Professor of religion and philosophy at Columbia University. Member of Fraternity of Leaders of the American Ethical Union; author and scholar in field of American philosophical and religious thought. The collection includes correspondence, manuscripts, course materials, research notes, minutes, clippings, reprints of articles, as well as 25 inscribed or annotated books.