San Francisco, April 23 -- San FranciscoApple CEO Tim Cook will hand the reins to hardware boss John Ternus later this year, capping a 15-year tenure that turned the company into a business worth $4 trillion that spans watches, video streaming and financial services. Ternus will become CEO on Sept. 1, when Cook will transition to executive chairman, the company said in a statement Monday. Ternus, 50, has served as head of hardware engineering since 2021 and spent 25 years focused on product development at the iPhone maker. Ternus must now chart a new path for one of Silicon Valley's most storied businesses at a challenging moment. Though Apple's growth remains strong, the company has struggled to catch up in artificial intelligence - techno...