Timothée Lacroix, Arthur Mensch, and Guillaume Lample are the co-founders of Mistral AI. Lacroix and Lample were two of the authors of Meta's original Llama paper.
Joel Kaplan has been working for Mark Zuckerberg at Meta for years — here he is with Zuckerberg after visiting French President Emmanuel Macron in 2018. Now, he is going to be Zuckerberg's top policy executive.