Apple Inc. Chief Operating Officer Jeff Williams is retiring as the company’s longtime No. 2, marking a major changing of the guard at an already tumultuous time for the iPhone maker.

Apple has announced that Sabih Khan, an Indian-origin executive with 30 years of experience at the tech giant, will be its new Chief Operating Officer (COO). Khan will take over from Jeff Williams, who is stepping down from the role this month and will retire later this year.

Sabih Khan will take over from Jeff Williams, who is stepping down from the role this month and will retire later this year. The leadership change comes at a time when Apple is facing challenges, such as slowing iPhone sales and tariff issues.

Apple Inc.’s top executive in charge of artificial intelligence models is leaving for Meta Platforms Inc., another setback in the iPhone maker’s struggling AI efforts.