John Tomac is widely considered one of the greatest (American) mountain bike racers of all time. During the early years of international racing he won numerous DH and XC events. He went on to be the namesake and involved with Tomac bikes. The 204 DH frame in the photo was their flagship model. The bike company then ceased to exist (in the late 2000s?). I also believe he helped coach several (a lot?) of racers over the years including Aaron Gwin for a time. Finally, if you’re into motocross, he is the father of Eli Tomac. Basically, John Tomac was...