VISIT CNBC.COMX Leadership LeadershipTim Cook is Silicon Valley's 'most imaginative' CEO, according to an IBM supercomputer Benjamin Snyder | @WriterSnyder 1 Hour Ago CNBC.com Stephen Lam | Reuters Tim Cook, CEO, holds an iPad Pro after his keynote address to Apple's annual world wide developer conference (WWDC) in San Jose, California, U.S. June 5,...