After a standout junior career with the London Knights, in which he scored 309 points in only three seasons, he was drafted by both the Los Angeles Sharks of the WHA and the Chicago Black Hawks of the National Hockey League (NHL).
Thomas played seven seasons in the WHA for the Sharks, Michigan Stags, Baltimore Blades, Indianapolis Racers, and Cincinnati Stingers.
After his career Thomas ran a farm and produce market just outside Lambeth, Ontario.
His son, Reg Thomas, Jr., played hockey as well, for the Sarnia Sting and Sault Ste.
This biographical article relating to a Canadian ice hockey centre born in the 1950s is a stub.