Bloomberg Businessweek: Allies and rivals alike praise Tim Cook’s operational skills, diplomatic instincts and unflappable temperament. “Tim may not be able to design a product like Steve Jobs,” said Berkshire Hathaway’s Warren Buffett. “But Tim understands the world to a degree that very, very few CEOs I’ve met over the past 60 years could match.” Outside: Tim Cook is both a nature nerd and a fitness obsessive.