In June, Schiller directed Apple’s virtual Worldwide Developers Conference, which went off without a hitch. He’s one of the most public-facing people from Apple’s Steve Jobs era through today.

“I first started at Apple when I was 27, this year I turned 60 and it is time for some planned changes in my life,” Schiller said in a press release. “I’ll keep working here as long as they will have me, I bleed six colors, but I also want to make some time in the years ahead for my family, friends, and a few personal projects I care deeply about.”

Another notable, longtime Apple employee recently left the company — designer Jony Ive exited in late June after more than 20 years on the job. He launched his own company, LoveFrom, with Apple as its first customer.

Joswiak is taking over Schiller’s role amid turmoil at the App Store. Cook recently testified before Congress in an antitrust hearing concerning the size and operations of the nation’s four largest technology companies — Apple, Google, Facebook and Amazon. There, he had to justify the App Store’s revenue-sharing model and potential monopoly on the iOS platform. Developers have been vocal about critical issues with transparency and equality on the App Store, and the time for an overhaul is nigh.