He's no fluke, though. He's been doing this since 1984 when he made his debut on the small screen in an episode of Knight Rider, and has continued to work both as an actor and comedian ever since.
His breakout role was as the bully, Biff in Back to the Future and its two sequels, but it was his role as Coach Fredricks in the wonderful, but short lived televisions series Freaks and Geeks, where he really was able to shine. His ability to humanize a stereotypical character is easier said than done and he did it with ease, as with all of the characters he plays.
His name might not be on everyone's lips, but it should be, for often the best actors are the ones that you can't tell are acting. Tom Wilson is certainly one of those, which makes him Not Very Famous...but should be.