Apple Inc’s new Siri engineering chief is overhauling the management team leading development of the beleaguered voice assistant, taking a step he assured employees would set the company up for success.

Mike Rockwell, head of engineering for the assistant, is replacing much of Siri’s leadership with lieutenants from his Vision Pro software group, according to people with knowledge of the matter. He’s also restructuring teams related to speech, understanding, performance and user experience, said the people, who asked not to be identified because the changes are private.