Nicknamed “Red” for the color of his hair, Dunn possessed an equally colorful personality. He earned five letters competing in football, basketball and baseball at Marquette Academy. Dunn later attended Marquette University, earning All-America honors while leading the “Golden Avalanche” in 1922 and 1923 to a 17-0-1 record. While a Packer, he served as Curly Lambeau’s “field general” for the 1929, 1930 and 1931 NFL Champions. He later returned to coaching, assisting Frank Murray at Marquette University (1932–40). He is a member of the Green Bay Packers and the Wisconsin Sports Hall of Fame.