During 1897–1908 he taught at the Protestant faculty of theology in Vienna, during 1908–1913 at the University of Rostock, during 1913–1921 in Kiel and in 1921–1935 in Berlin.
Selama tahun 1897-1908 ia mengajar di Fakultas Teologi Protestan di Wina, selama tahun 1908-1913 di Universitas Rostock, selama tahun 1913-1921 di Kiel dan tahun 1921-1935 di Berlin.