Stephen Roberto is a Brazilian jiu jitsu black belt under Enson Inoue, being also a pioneer of the sport/martial art in Guam (as well the island's first black belt), where he established an affiliate of the famous Japanese academy - Purebred. A former mixed martial arts (MMA) fighter, Roberto is regarded as a great developer of jiu jitsu in Micronesia's US territory, having built one of the most well established grappling programs in the famous fighting island.