  Kotarbiński was appointed professor of philosophy in Warsaw in 1919. His teaching activity resulted in a group of scholars working mainly in the philosophy of science, including Janina Hosiasson (later Mrs. Lindenbaum; 1899–1942), Edward Poznański (1901–1976), Dina Sztejnbarg (later Mrs. Kotarbiński) (1901–1997) and Aleksander Wundheiler (1902–1957).