After graduation in Munich 1896 he studied there and in Berlin to promotion in 1904 with Theodor Lipps and initially took its psychologism. After private studies with Edmund Husserl in Göttingen and Carl Stumpf in Berlin followed in 1910 in Munich, the Habilitation. He criticized Husserl evidence concept in the essences. From 1914 to 1918 he served in World War I and received the Iron Cross second class. In the winter semester 1916/17 he was appointed to Munster. He had the "courage to metaphysics" found through his front experience and returned hereinafter apparent faith. He was Protestant, probably with some Jewish roots. His Leibniz interpretation 1925 came the "Germanic thinkers" out.
- Das Vergleichen und die Relationserkenntnis, Leipzig/Berlin: B. G. Teubner, 1910
- Das Grundproblem Kants, 1914
- Hegel, 1922
- Leibniz, 1922