Key members of Google’s old guard have been shifting roles or leaving the company as it searches for its new identity. From a report: The changes encompass high-profile executives such as finance chief Ruth Porat, YouTube CEO Susan Wojcicki and employee No. 8, Urs Holzle, among others. Some say they have left their roles for a new challenge and others have left to seek opportunities in artificial intelligence. In February, Wojcicki — one of the most prominent women in Silicon Valley — announced that she was stepping back after nine years at the helm of the Google-owned platform that grew to be the world’s most popular video service. She had been at Google for more than 25 years, after famously lending her garage to Google founders Sergey Brin and Larry Page to use as their first office.

While she’ll still be in an advisory role at Google, she said she wanted to “start a new chapter.” Wojcicki wasn’t the only executive to leave YouTube. Robert Kyncl, the chief business officer for 12 years, stepped away to become CEO of Warner Music Group at the beginning of the year. In March, CapitalG founder and longtime Google employee David Lawee stepped down from his role after 17 years at Alphabet, saying he wanted to explore new areas of interest and spend more time with his family