Meet John Ternus, the Apple exec who replaced Tim Cook as CEO

John Ternus was Apple's head of hardware engineering. Justin Sullivan/Getty Images John Ternus succeeded Tim Cook as Apple's CEO on Tuesday. Ternus, who joined Apple in 2001, is known for his leadership in hardware engineering. He has showcased Apple's innovations at major events like WWDC. It's official. John Ternus has replaced Tim Cook as Apple's CEO. Ternus, a career product guy, is taking the helm after Cook, an operations guy, led the company for just over 15 years. Cook's famed…