Avie Tevanian joined investment firm Elevation Partners today as a managing director. Tevanian spent more than a decade at Apple before he retired in 2006. He is credited with helping turn around the company as the chief software technology officer, in charge of Apple’s vaunted OS X operating system, which is now used on everything from the MacBook air to the iPhone. At Elevation, he’ll rub shoulders with the likes of U2’s Bono, investor Roger McNamee, and former Apple chief financial officer Fred Anderson. We caught up with him for an interview.