 After the war Chlebowski was employed by the Klinik Internal Diseases in Kraków and Łódź, and by Habilitował in Lodz in 1948.In 1951 Chlebowski became involved in the founding of the Medical University of Białystok and was appointed Professor of Medicine and Director of the Department of Internal Diseases.In 1953 Chlebowski stood up for one of his university students, who was removed from school at the request of the Board for concealing his connection with the underground anti-Hitler movement.