Another Apple(s AAPL) executive who was part of Steve Jobs’ inner circle at Apple is heading out the door. This time it’s Bob Mansfield, the SVP for Hardware Engineering. Apple announced Thursday afternoon that he will be retiring. No date was given for his exit.

Replacing Mansfield in his role heading up the crucial iPhone and iPad engineering teams will be his longtime deputy Dan Riccio, who’s been VP of iPad Hardware Engineering. The transition to Mansfield’s role will take “several months,” according to Apple’s release.

“Bob has been an instrumental part of our executive team, leading the hardware engineering organization and overseeing the team that has delivered dozens of breakthrough products over the years,” said Apple CEO Tim Cook said in a press release. “We are very sad to have him leave and hope he enjoys every day of his retirement.”

As for Riccio, Cook calls him “well respected…

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