He was promoted to full professor in Berlin in 1919, three years after he returned there, and he held this chair until he was dismissed by the Nazis in 1935.
Siya ay itaas upang ganap na propesor sa Berlin sa 1919, tatlong taon matapos niyang bumalik doon, at siya gaganapin ito upuan hanggang siya ay awas sa pamamagitan ng Nazis in 1935.