Billionaire entrepreneur John Paul DeJoria made his fortune by cofounding mega-companies like Paul Mitchell hair products and Patron tequila. Now, he’s trying to tackle the digital music arena with his new company Rok Mobile. We talked to DeJoria about his financial successes and the lessons he learned along the way. A menial job at a dry cleaner’s when he was 16 taught him something invaluable, he says. “Success is how well you do what you do when nobody else is looking.”