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Apple Inc. is handing oversight of its Siri team to new artificial-intelligence chief John Giannandrea three months after hiring him from rival Google, shifting responsibility for the voice-assistant technology to its third leader in the past year. Apple announced Mr. Giannandrea's hiring internally in early April but hadn't publicly laid out his responsibilities until Tuesday, when it added him to the corporate leadership page of its website. It said he will report directly to Chief Executive Tim Cook, with the title chief of machine learning and AI strategy and a purview that includes development of Siri technologies.