A key executive from the Steve Jobs era at Apple is set to retire. Dan Riccio, a senior executive at Apple, is about to retire and is responsible for overseeing the company's progress in the field of mixed reality headsets. He previously served as the head of hardware engineering at the company. According to insiders, the vice president who reports to Apple CEO Tim Cook will leave the company this month, and John Ternus, the head of hardware engineering, will be responsible for the Vision Products Group (VPG).