Panos Panay, the chief product officer at Microsoft, leading Windows development and the company’s Surface line, is leaving Microsoft. In an email on Monday, Rajesh Jha, Microsoft’s vice president of experience and devices, told employees: “After nearly 20 years at the company, Panos Panay has decided to leave Microsoft.”

Panay’s departure from Microsoft is somewhat abrupt. Just last month, Panay mentioned he was excited to appear at Microsoft’s special event that’s set to take place on Thursday, September 21st, where the company is poised to reveal the latest additions to its Surface lineup and “AI innovation.” However, Microsoft spokesperson Frank Shaw tells The Verge Panay will not appear at this week’s event.