John Ternus, who will succeed Tim Cook as Apple CEO, has said previous innovations will help inform future advancements.

Apple Inc. Chief Executive Officer 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,

Apple was worth around $300 million when he became CEO. It’s worth more than $4 trillion today, thanks to the consumer tech ecosystem Cook established, and the recurring revenues from the iPhone.