Harold Mitchelmore served his community of Saskatoon in the capacity of photo referee, track referee and timer or walk judge, at every level possible.
At the provincial and Western Canadian level, Mitchelmore officiated at numerous competitions, one being the Western Canada Summer Games. He also served on a variety of provincial sport-related boards.
Harold worked as a timer or photo referee at national track and field competitions, as well as national junior football championships. International qualifications as a photo timer and photo referee allowed him to officiate at the 1976 Olympic Games, as well as other international competitions.