On Wednesday, Google co-founder Sergey Brin took a break from his work on the Internet search leader’s undisclosed projects so that he could make a surprise to make a surprise arrival at a technology conference.

Even if, he had shared few details about their secret project, Brin claims he is always busy since he started over a decade ago as the company’s president of technology. This year, his projects are stealth as part of a shake-up that led to his longtime partner, Larry Page, as Google’s CEO. Brin has kept a low profile ever since the changes.