Walter Hader has been involved as a medical volunteer and administrator serving a variety of sports in Saskatchewan.
He was the team physician for the University of Saskatchewan football (1990 and 1996) and hockey (1983) teams that were Canadian champions. He served in a number of capacities with the Canadian Amateur Speed Skating Association (CASSA) including director and vice-president. He was actively involved with the Saskatchewan Academy of Sport Medicine and the Canadian Academy of Sports Medicine.
His long list of volunteering includes the 1976 Montreal Olympics, 1974 and 1989 Saskatchewan Indoor Games, Western Canada Summer Games, 1971 Canada Winter Games, 1973 Special Olympics and the 1998 Saskatchewan Summer Games.
He was inducted into the Saskatoon Sports Hall of Fame in 1997.