Scott Forstall, the Sorcerer's Apprentice at Apple - Businessweek

From an extensive Scott Forstall profile

With the death of Jobs at age 56, Forstall has now become an even more important and visible member of Apple’s leadership team. As the person in charge of Apple’s mobile software division, he oversees the iOS operating system, which runs the iPhone and iPad, devices that account for 70 percent of Apple’s revenues. At 42 he’s the youngest senior executive at Apple. He may also be the best remaining proxy for the voice of Steve Jobs, the person most likely to channel the departed co-founder’s exacting vision for how technology should work. “He was as close to Steve as anybody at the company,” says Andy Miller, who headed Apple’s fledgling iAd group before leaving the company this summer. “When he says stuff, people listen.”

Scott Forstall, the Sorcerer's Apprentice at Apple - Businessweek