Messing with the Bull: Riding Champ Gary Leffew Gary Leffew is a former bull-riding champ, actor, stunt coordinator and consultant to HBO's Deadwood. He punches up scripts for David Milch's Deadwood, making sure the cowboys talk like real cowboys do. In 1970 he won the world championship bull riding competition. After that Leffew took up acting and appeared in many commercials. Now he teaches bull riding at his California Ranch.