In 1930, earned his doctorate at the University of Warsaw on the work of Sur le movement tournant d'un corps dans un champ de gravitation, and began to live there in 1932. He became a professor at the University of Kazan in 1936. The following year, he returned to Warsaw. He corresponded with Albert Einstein. In the years 1937–1939, he worked at the Jagiellonian University, under Jan Weyssenhoff [ pl ].