In 1963, Mann brought some of his artwork to the Kansas City Custom Car Show. There biker/artist Tom Fugle took an interest in his artwork, and with Mann's permission, showed a photo of the painting "Hollywood Run" to Ed "Big Daddy" Roth, an artist and custom car painter, who was then the publisher of one of the first custom motorcycle magazines, "Choppers". Roth loved the painting and commissioned 10 (or as many as 14 or 20, according to different sources) original posters, which were made available in the back pages of "Easyriders" for many years. In 1965, Mann joined Fugle's El Forastero Motorcycle Club, becoming one of the founding members of the Kansas City Charter. In 1971 he answered an advertisement for a "motorcycle artist" in the back of a new motorcycle magazine called "Easyriders."