John Ternus will take the helm at Apple on Sept. 1. When incoming CEO John Ternus assumes leadership of Apple later this year, he'll inherit a series of significant challenges facing the tech giant. But his decades of experience within the company should position him well to navigate those tides. Ternus, whom Tim Cook named as his successor on Monday, currently serves as Apple's senior vice president of hardware engineering until Sept. 1. Cook will transition to become...