Elon Musk and Shivon Zilis with their twins. Courtesy of Walter Isaacson Updated 2026-05-05T10:06:01.235Z AI investor and developer Shivon Zilis is a longtime executive at Elon Musk's companies. She could testify as soon as Tuesday at Musk's ongoing civil trial against OpenAI's Sam Altman. A director at Neuralink, Zilis is a plaintiff in the trial and has four children with Musk. Shivon Zilis — a longtime executive at Elon Musk's companies and the mother of four of his children — is scheduled to testify this week at Musk's ongoing civil trial against OpenAI's Sam Altman. The trial, which started last week in federal court in Oakland, California, centers on Musk's claims that Altman took his $38 million early investment in the company behind ChatGPT, then reneged on his promise that it would remain solely nonprofit. Zillis, who joined Musk as a plaintiff in the $134 billion lawsuit that led to the trial, is a key witness , having had a front-row seat to many of the events before the six-member jury.…