He served as head of the department of higher mathematics and, in 1906-07, he was the dean of the Faculty of Mathematics and Sciences. In 1911 he left Kolozsvár and moved to the University of Giessen, Germany, where he continued to teach until he retired in 1930.
Siya ay nagsilbi bilang pinuno ng departamento ng mas mataas na matematika at, sa 1906-07, siya ay ang dekano ng Faculty ng Matematika at Agham. 1911 siya sa kaliwa Kolozsvár at inilipat sa University of Giessen, Alemanya, kung saan siya ay patuloy na magturo hanggang siya ay nagretiro sa 1930.