Born and raised in North Battleford, Saskatchewan, Gerein suffered a broken neck in 1982 while training racehorses. He first competed as a swimmer at the 1984 Paralympics in Los Angeles, but subsequently had his greatest success competing in racing events, winning seven gold, four silver and three bronze medals during his racing career. He retired from competitive racing after the 2008 Paralympics. Clayton later[when?] lived in Pilot Butte, Saskatchewan for a long part of his lifetime and career and was seen all around town practicing.
Gerein was named SaskSport's male athlete of the year in 1987, 1996 and 2001.
- Rob Vanstone, "Seven-time Paralympian Clayton Gerein dies at age 45" Archived 2018-09-21 at the Wayback Machine. Regina Leader-Post, January 25, 2010.
- Clayton Gerein at the Encyclopedia of Saskatchewan.
- "About Pilot Butte". Town of Pilot Butte. Retrieved 2020-09-30.
- L Franks, "Lisa Franks Biography" Archived 2008-08-28 at the Wayback Machine. lisafranks.net, August 26, 2008.