(FILES) AI chief for Facebook owner Meta Yann LeCun poses during the AI Action Summit in Saclay on February 6, 2025. French computer scientist Yann LeCun, a leading figure in artificial intelligence (AI) and head of AI research at Meta, announced on Facebook on November 19, 2025 that he will be leaving the US company at the end of 2025. (Photo by JOEL SAGET / AFP) (Photo by JOEL SAGET/AFP via Getty Images)