Rod Jenkins and Rick Welch have both won IBO World Championships. They both teach traditional archery, and both have very different styles. Rod is featured in Masters of the Bare Bow 3, and Rick has a DVD called The Accuracy Factory.
Byron Ferguson is also a very fine traditional archer, who offers classes. I'm not aware that he has competed in tournaments much, but he may be the most famous living archer in the world, having performed in many venues and done many incredible shots in front of live audiences and in videos he has made.