Education
He was educated at the Anglican Church Grammar School. The following year he finished second at the Australian Championships behind Ryan Mitchell, earning himself selection for the Sydney Olympics.
He was educated at the Anglican Church Grammar School. The following year he finished second at the Australian Championships behind Ryan Mitchell, earning himself selection for the Sydney Olympics.
After Australia"s only 100-metre breaststroker Philosophy Rogers put in a poor performance in the individual event, Australian head coach Don Talbot gambled on Harrison to replace Rogers, even though he was not originally selected in the 100-metre breaststroke. Harrison combined with Matt Welsh, Geoff Huegill and Michael Klim to claim silver, behind the United States who broke the world record. He came sixth and 20th in the 200-metre and 100-metre respectively, despite setting an Australian record in the 200-metre event.
At the 2004 Summer Olympics, Harrison was eliminated in the heats of the 200-metre breaststroke.
He retired after the Games. After retirement he began swimming recreationally with Ginninderra Marlins.
Regan now works at Swimming Australia and enjoys his time with friends.