https://arstechnica.com/information-technology/2020/03/bill-gates-steps-down-from-microsoft-board/

Just over 20 years after stepping down as CEO of Microsoft and six years after relinquishing his position as Chairman of the Board, Microsoft cofounder Bill Gates has resigned from the Microsoft Board of Directors. Gates, 64, is leaving the board to spend more time on philanthropic ventures.

"I have made the decision to step down from both of the public boards on which I serve—Microsoft and Berkshire Hathaway—to dedicate more time to philanthropic priorities including global health and development, education, and my increasing engagement in tackling climate change," Gates wrote in a post on LinkedIn announcing the decision. "The leadership at the Berkshire companies and Microsoft has never been stronger, so the time is right to take this step."