Under tremendous pressure to continue the innovative performance record forged by Steve Jobs, Tim Cook officially took over as CEO of Apple five years ago, with looming questions about his ability to deliver.
As Cook celebrates his fifth anniversary as chief, questions still linger.
Cook's biggest win has been Apple's old big win: the iPhone. The company has expanded the lineup and now offers three new iPhones each year: the 4.7-inch iPhone, the 5.5-inch Plus and the 4-inch SE. Getting into bigger devices with the iPhone 6 in 2014 helped Apple become the most profitable company in the world.