Tim Cook steps down as Apple CEO after 15 years, John Ternus takes over

Tim Cook is stepping down as Apple's CEO after 15 years in the role, with hardware chief John Ternus named as his successor. Cook took over in 2011 from co-founder Steve Jobs, inheriting a company already riding high on the success of the Mac, iPod, and iPhone. During his tenure, Cook oversaw the launch of numerous new products, services, and features that became central to Apple's identity. His 15-year run included notable highs and lows, but he is widely credited with cementing Apple's status as one of the world's most valuable companies.