<ul data-eligibleForWebStory="false">Jeff Williams, Apple’s chief operating officer, is stepping down later this month as announced by the company on Tuesday.Sabih Khan, the senior vice president of operations, has been appointed as the new COO.Williams plans to retire in order to spend more time with friends and family, including his grandchildren.Before his retirement, Williams will oversee the design team and the Apple Watch, reporting to CEO Tim Cook.