Career
Stefan was professor on the Lwów University since 1939. During the German occupation of Poland in World World War II he became principal of the Underground University of Lwów, accidentally jailed.
Stefan was professor on the Lwów University since 1939. During the German occupation of Poland in World World War II he became principal of the Underground University of Lwów, accidentally jailed.
In 1946 he became professor at the Wrocław University and since 1991 member of the Polish Academy of Skills (PAU).