<ul data-eligibleForWebStory="false">Jeff Williams, Apple's COO since 2010, is set to retire later this year. Sabih Khan will take over his position.This transition marks the end of speculations about Williams eventually succeeding Tim Cook as CEO.Tim Cook praised Williams for his contributions to Apple's supply chain, the Apple Watch launch, and health strategy.As Williams steps down, he will continue to oversee Apple's design team and health initiatives until his full retirement later this year.