 He coached there during through 1942 and served as Northwestern's baseball coach from 1936–1939 as well.In 1943 Ingwersen joined the U.S. Navy and served in World War II as Athletic Director for the Navy's North Carolina pre-flight school through June 1945.After the war, Ingwersen again became an assistant coach at his alma mater, the University of Illinois, this time under Ray Eliot.