A fanatical devotion to sneaker design and a technical fluency rare among CEOs propelled the 58-year-old Nike lifer to the top perch of the footwear and apparel giant, which has reached annual revenues of $24 billion, up 60 percent since he was appointed in 2006. "Have you heard the Japanese word otaku?" he muses. "It means being deeply obsessed by the details of something. I relate to that."