The Unity of Popper's Thought. In Paul A. Schilpp (ed.): The Philosophy of Karl Popper, Book I. La Salle, Illinois 1974 (Open Court), ISBN 0-87548-141-8, pp.
He was born in Dillenburg, Germany and immigrated to the United States prior to World War I. Schilpp taught at Northwestern University, University of the Pacific and spent the last years of his professional career teaching undergraduate philosophy courses at Southern Illinois University at Carbondale.
In its run it contained articles by many philosophers including Paul Arthur Schilpp, Hugo Adam Bedau, Brand Blanshard, Abraham Edel, and Gordon W. Allport.
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