(MONEY Magazine) – Some kids like dinosaurs; little Max Kellerman loved boxing. "I read and reread Ali's bio. It became real hero worship." He turned his pugilistic passion into a comprehensive study of the sport. At 16, he launched Max on Boxing, a hilariously homespun Wayne's World-style public access show in Manhattan. The scrawny teen talked old-time boxing better than cigar-chomping has-beens; his analysis earned him serious fans (Dustin Hoffman called in once) and his first grown-up gig--at ESPN. Kellerman, 30, now headlines I, Max on Fox, and his income approaches seven figures. That's packing quite a punch. --E.M.