After retiring, Harmison entered sports administration, where he served as general manager of both the Hawks and the NBL.
[1] He attended Ames High School and led the basketball team to an undefeated state championship season in 1976.
[1] Harmison chose to remain in Ames for college, where he attended Iowa State University.
[2] After graduating college, Harmison had a season in Belgium[1] before moving to Australia in 1982 to play for the Nunawading Spectres of the National Basketball League (NBL).
[14] After retiring from playing, the Illawarra Hawks moved Harmison into the front office and appointed him the general manager of the team, a position he held for seven years.