This collection contains Marvin Lowenthal's correspondence, journals, diaries, documents, photographs, memorabilia, and printed materials relating to his life, writings, Zionist activities, and relief work on behalf of German Jewry. Includes material on his youth, school work, and college years, as well as autobiographical writings and family correspondence containing information on Horace Kallen and early 20th century Zionist activities. Of particular note is his later correspondence with Jacob Billikopf, Jerome Frank, Horace M. Kallen, Elmer Rice, Eugene C. Taylor, and Stephen S. Wise.