After the outbreak of Second World War he continued his studies at the Lwów University, now Ivan Franko National University, until the beginning of the German occupation of Poland in 1941. From 1941–1944 he studied at the underground Polish university. After the war he was displaced to Kraków and was employed as assistant at the Faculty of Physics of the Silesian Polytechnics, but continued his studies of physics at the Jagiellonian University under Jan Weyssenhoff and Konstanty Zakrzewski. 1945 he moved to the University of Wrocław, where he was employed as assistant of the Theoretical Physics department.