An AI Researcher Who Jumped Between Top AI Companies Is Back at Google
Barret Zoph has been appointed vice president of research at Google DeepMind, returning to the company where he started his AI career years ago. Reuters reported the appointment on August 27, 2026. Zoph confirmed the move on his personal X account, noting that he first entered the field through Google's Brain Residency program.
A Google spokesperson told the Wall Street Journal that the company looks forward to Zoph "returning and bringing his reinforcement learning and post-training expertise to Gemini." That phrasing is notable. Zoph is best known for his work on post-training, the stage where an AI model that has already learned from large amounts of text gets fine-tuned so it gives helpful, safe, and reliable answers. Think of it as the difference between someone who has read every book in a library and someone who has been trained to use that knowledge well in conversation.
Zoph's career over the past two years reads as a compressed map of how talent moves between top AI companies. He left OpenAI in October 2024 to co-found Thinking Machines Lab with Mira Murati, who had departed OpenAI the previous month. The startup was formally unveiled in February 2025 and brought together many of Murati's former OpenAI colleagues. John Schulman joined as chief scientist, with Zoph serving as CTO. TechCrunch reported those titles at the time of the company's public launch. By July 2025, Thinking Machines Lab had reached a $12 billion valuation in a seed funding round, according to TechCrunch.
The startup's co-founders left quickly. In January 2026, Zoph and fellow co-founder Luke Metz departed to rejoin OpenAI, as TechCrunch first reported. A March 2026 TechCrunch report indicated that Sam Schoenholz had also departed, making three co-founders who left for OpenAI in early 2026.
On his return to OpenAI, Zoph was given a different role than before. Instead of leading research on AI model development, he was tasked with heading AI enterprise sales. He stayed roughly five months, departing in June 2026 (The Verge). His personal website lists his previous title at OpenAI as VP of Research (Post-Training), confirming the shift in responsibility between his two stints at the company.
Zoph's move to Google DeepMind closes a loop that began in Google's Brain Residency program and now places him in a research leadership position over Gemini, Google's main AI model. The role positions him alongside the teams building Gemini's post-training pipeline, the same area where he built his reputation at OpenAI before the Thinking Machines Lab detour.
The broader context here is one of persistent talent circulation among a small number of leading AI labs. Zoph has now worked at three of them, Google, OpenAI, and Thinking Machines Lab, and returned to Google in under two years. His brief at OpenAI this year, enterprise sales rather than research, suggests that organization was testing where his strengths fit during his second tenure; the reassignment did not hold. Google, by contrast, is bringing him back into a research role directly aligned with his core expertise.
One open question is what Zoph's arrival means for DeepMind's existing research leadership. Google has not disclosed details beyond the VP of Research title and the spokesperson's reference to Gemini. What is clear is that a researcher with hands-on experience refining AI models at OpenAI is now inside the organization competing most directly with OpenAI in the race between Google's Gemini and OpenAI's GPT models. Whether that transfer of knowledge leads to noticeable improvements in Gemini will become apparent over future model releases.
