He won two medals at the Ice Hockey European Championships in 1924 and 1927, and finished 5th and 13th at the 1928 and 1936 Winter Olympics, respectively. He was also present at the 1924 Olympics as a substitute player. At the 1927 European Championships Kreitz was the team captain and top scorer (7 goals in 5 games), and was selected as best player of the tournament.