Additionally, with Kurt Wildhagen (1871-1949), he edited works by Turgenev, Gogol and two volumes of Ernst Cassirer's edition of Kant's collected writings.
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Her doctoral dissertation, written under the supervision of Ernst Cassirer, concerned Lessing and Leibniz.
However despite his influence (on the work of philosophers Max Scheler, Ernst Cassirer, Martin Heidegger, Maurice Merleau-Ponty, Georges Canguilhem, Gilles Deleuze and Félix Guattari (in their A Thousand Plateaus), for example) he is still not widely known, and his books are mostly out of print in German and in English.
In Berlin and Marburg, he took courses in philosophy, psychology, and pedagogics under Hermann Cohen, Paul Natorp, Ernst Cassirer, Hermann Alexander Diels, and Heinrich Wölfflin.