Dec. 1 (UPI) -- Apple's artificial intelligence chief is stepping down, the company announced Monday in an AI leadership shakeup over Siri delays, as the iPhone maker vowed to "strengthen its commitment to shaping the future of AI for users everywhere."

John Giannandrea, who has served as Apple's senior vice president for Machine Learning and AI Strategy since 2018, will serve as an adviser to the company before retiring next spring.

"We are thankful for the role John played in building and advancing our AI work, helping Apple continue to innovate and enrich the lives of our users," Tim Cook, Apple's chief executive officer, said Monday in a statement.

Cook also announced "renowned AI researcher" Amar Subramanya has joined Apple as vice president of AI and will report to Craig Federighi, senior vice president of software engineering.

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