This was for a short time, however, since In 1919 he was appointed to a chair in the University of Hamburg, a post which he held for the rest of his career.
Ito ay para sa isang maikling panahon, gayunpaman, dahil Sa 1919 siya ay hihirangin upang angkinin ang isang upuan sa Unibersidad ng Hamburg, isang post na kung saan siya para sa gaganapin ang natitirang bahagi ng kanyang karera.