Trading September 9, 2026

Meta AI Researcher Andrew Tulloch Departs Following Muse Launch, Semafor Says

Meta AI Researcher Andrew Tulloch Departs Following Muse Launch, Semafor Says
MetaAndrew TullochAI researchMuseSemaforMark ZuckerbergOpen Source AIExecutive Departure

Meta AI researcher Andrew Tulloch is leaving the company after its rollout of new AI products, Semafor reported, citing someone briefed on the matter.

Tulloch postponed his departure until Meta had successfully introduced its new family of open-source AI models and the Muse AI assistant, which was announced on Tuesday.

Tulloch joined Meta from Thinking Machine Labs and had been part of the company's TBD lab, the focal point of CEO Mark Zuckerberg's AI strategy. The lab is led by Scale AI founder Alexandr Wang.

During his time at Meta, Tulloch drew attention as one of the technology industry's highest-paid employees. It is unclear why he left or whether he intends to pursue AI research elsewhere.

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