Apple COO Jeff Williams is retiring after 27 years. His exit marks another recent major leadership shift at the company.

Jeff Williams has been Apple's Chief Operating Officer since 2010, but he's begun his retirement process and will be passing the reins to Sabih Khan.

A bombshell announcement from Cupertino late on Wednesday is reshaping the highest echelons of leadership at Apple, the world’s most valuable and scrutinised corporation. Jeff Williams, the Chief Operating Officer for the past decade and a figure many considered a potential,