|Born at Erfurt on 20 April 1890. Studied philosophy at various universities and was a lecturer and assistant professor at the University of Berlin, 1924-1935. Emigrated to Great Britain in 1935. Held a research fellowship at the University of Birmingham in 1936. Emigrated to the USA in 1939, where he taught at various colleges and was consultant in philosophy to the Library of Congress. Died in New York City on 21 July 1963.