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.

Sabih Khan was 10 when his family left Uttar Pradesh’s Moradabad for Singapore in 1976. He was just another bright-eyed Indian child, landing in a city bursting with ambition. He barely spoke English then.