Jimmy Dunn devoted a lifetime to organizing and improving amateur hockey in his native Manitoba. He was considered a dedicated problem solver who devoted himself equally to all age groups and a variety of sports.
Born in Winnipeg, Manitoba, Dunn played minor hockey before enlisting in World War I in 1916 at the age of 17. He was unable to play after returning from the war as a result of trench feet. He became involved in the administrative side of minor hockey in Winnipeg and a number of his team's were taken in by the Manitoba Amateur Hockey Association in 1927.
Between 1927 and 1941 he worked as the chief secretary and convenor for the MAHA. The next year he became the association's vice president and three years later began a six -year tenure as president. The Canadian Amateur Hockey Association (CAHA) took note of Dunn's reputation and moved quickly to bring him into the fold. He worked effectively as second vice-president (1950-52), first vice-president (1952-54), and president (1955-57). He served on the Hockey Hall of Fame Selection Committee in 1961, the year the new facility was opened on the grounds of the Canadian National Exhibition. Dunn also served as secretary-treasurer of the Manitoba Hockey Players Foundation, Inc. and was the convenor of the Centennial World tournament in 1967.
Dunn also held positions with a number of other sports. He was a timekeeper at Winnipeg Blue Bombers football games since the first season in 1933, was president of the Greater Winnipeg Men's and Girls' Senior Baseball Leagues, and vice president of the Western Canada Baseball Association.
Dunn was elected to the Hockey Hall of Fame in 1968.