In 1950, he graduated from the University of Wyoming and became head basketball coach, teacher, and assistant football coach at Cody High School. He accepted the same positions at Worland High School in 1953. During his years as a high-school coach, his teams won more than 100 games and several district and regional titles.
He returned to UW in 1958 and served as head athletic trainer for 26 years. His life's work and passion were treating injuries for athletes "of all ages and abilities." UW Cowboy teams won numerous conference championships, played in six bowl games, and often competed in the NCAA basketball tournament during his tenure.
Jack’s certification number was D7-001 (A being first in the alphabet). He served as a District Director and District Secretary.
In 1979, he was selected as head trainer for the U.S. Olympics basketball development program and traveled to Russia, Czechoslovakia, Yugoslavia, France and Israel. He also was a guest trainer for the Canadian Football League's Calgary Stampeders for almost 10 years.
He was voted into the National Athletic Trainer Hall of Fame in 1981; received the National High School Coaches Assoc. distinguished service award in 1982; was elected to the Wyoming Coaches Assoc. Hall of Fame in 1984; received UW's Cowboy Joe "White Hat Award" in 1988; was inducted into the UW Athletic Hall of Fame in 1995; and elected into the Wyoming Sports Hall of Fame in 2004.
Jack Barrett Aggers died Jan. 29, 2006, at McKee Hospital Hospice Center in Loveland, after valiantly fighting the complications of a stroke suffered more than 20 years earlier. He married Betty Dawson of Laramie in 1947.