The Witness Who Became a Liability

Zilis, who shares four children with Musk, testified that she acted as a bridge between the billionaire and his various ventures, including Tesla and OpenAI. While she maintained her professional conduct remained untarnished, her own internal notes—revealed during the trial—painted a different picture. These documents, which chronicled sensitive discussions between OpenAI co-founders, provided evidence that she was documenting the company's internal shift toward a for-profit structure while simultaneously managing Musk’s interests.

Her credibility faced intense scrutiny under cross-examination. Zilis struggled to reconcile her courtroom statements with prior deposition testimony, particularly regarding her knowledge of Musk’s competing AI ventures. OpenAI attorneys highlighted instances where she appeared to serve as a conduit for information back to Musk, even while sitting on the OpenAI board. The trial revealed that Zilis was aware of Musk’s decision to freeze funding to OpenAI well before he formally communicated it to the board, further suggesting that her primary allegiance remained with the man who fathered her children rather than her fiduciary duties to the company.

Ultimately, the documents Zilis kept during 2017 and 2018 proved most damaging. They detailed Musk’s desire to either control OpenAI or subsume it into Tesla, confirming that his primary grievance was not the company's mission, but his lack of command over its trajectory. By the time Zilis concluded her testimony, her attempts to appear as a neutral, soft-spoken observer had largely dissolved, leaving the court with the impression of a witness whose loyalty to Musk outweighed all other professional obligations.