SAN FRANCISCO, CA - JUNE 08: Apple senior vice president of Software Engineering, Craig Federighi (L), shakes hands with Apple CEO Tim Cook during the Apple WWDC on June 8, 2015 in San Francisco, California. Apple annouced a new OS X, El Capitan, and iOS 9 during the keynote at the annual developers conference that runs through June 12. (Photo by Justin Sullivan/Getty Images)
