You may know Dave Stewart as the Eurythmics cofounder and a singer's songwriter -- he's written hits for Tom Petty, Celine Dion, and No Doubt. But it's the rest of his CV that's unexpectedly impressive. He started the consulting company DeepStew with Deepak Chopra, acts as U.S. creative director for the Law Firm ad group, serves as president of entertainment for fashion designer Christian Audigier's brand-management unit, and is an official Change Agent for Nokia. "I'm willing to receive a smaller percentage and relinquish control, as long as the idea goes into the minds of a brilliant company," he says. "I'm not going to run out of creativity or ideas, so I don't hang on to stuff for dear life. If you're terrified to release control, nothing gets made!" -- by Mark Borden