Apple's new CEO John Ternus takes the helm of the iconic tech giant on Tuesday, ending Tim Cook's 15-year tenure during which the company's value skyrocket to $4.6 trillion thanks to the iPhone's enormous popularity. Read more: ↧ Apple's new CEO, John Ternus, takes over from Tim Cook after 15 years Apple’s new CEO John Ternus takes the helm of the iconic tech giant on Tuesday, ending Tim Cook’s 15-year tenure that saw the company’s value skyrocket to $4.6 trillion thanks to the iPhone’s enormous popularity