Williams previously led Apple’s health initiatives and passed the role of COO to Sabih Khan, the iPhonemaker’s former vice president of operations, in July. The company is splitting up Williams’ other responsibilities before his departure at the end of this year, with Apple software head Craig Federighi taking over watchOS, and hardware leader John Ternus overseeing Apple Watch hardware engineering, according to Bloomberg.

Apple is shuffling other positions as well. Bloomberg reports that Apple fitness chief Jay Blahnik will report to health VP Sumbul Desai amid an internal investigation into conduct. Both Blahnik and Desai previously reported to Williams. In August, The New York Times reported that a former employee sued Blahnik, accusing him of creating a toxic work environment.