On March 27, 2026, Ross Nordeen, the last surviving co-founder of xAI, quietly left the company. He removed his xAI employee certification from the X platform, did not send a farewell letter, and only shared a photo of himself hiking in the woods. With this, the entire xAI founding team assembled by Musk in July 2023 has left, leaving only Musk.
Ross Nordeen was a core member of Musk’s inner circle, having followed him since the Tesla Autopilot team, where he was responsible for building the autonomous driving data center. After joining xAI, he reported directly to Musk, leading the data center computing strategy, building the full-stack infrastructure from the underlying hardware to the software layer, and single-handedly creating the Colossus supercomputing cluster equipped with over 200,000 NVIDIA H100 GPUs, laying a solid foundation for xAI’s AI training computing power.
This departure marks the end of a months-long wave of departures at xAI. Starting in January 2026, several co-founders left one after another. After Manuel Kroiss, the head of pre-training, resigned on March 25, Nordeen became the last remaining member. The collective departure of the founding team has put this AI company, valued at over $250 billion, into a rebuilding phase. The future direction of xAI, under Musk’s sole leadership, has become the focus of the industry.
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