He was “sympathizer” of “Die Maler des Jungen Rheinlands”, the painters of the young Rhineland, and was in contact with personalities such as Hermann Hesse, Thomas Mann, Stefan Zweig, Hanns Heinz Ewers, Frank Wedekind, Gerhart Hauptmann, Lulu von Strauß und Torney, Felix Hollaender, Else Lasker-Schüler, Erich Mühsam, Peter Hille, John Henry Mackay, Herwarth Walden, Emil Ludwig, Franz Werfel, Wilhelm Schmidtbonn, and others.
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In 1923 he lectured in the United States, where he was invited as the “first German after Einstein” to speak at Columbia University.
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