Barret Zoph lands at Google after a year of bouncing between OpenAI and Thinking Machines
The AI researcher has held four senior roles in roughly 18 months. His latest stop is Google's Gemini team, where his reinforcement learning expertise will be put to work.
Key points
- Barret Zoph joined Google as vice president of research in mid-2026, his fourth senior AI role in roughly 18 months.
- Zoph co-founded Thinking Machines with former OpenAI chief technology officer Mira Murati in late 2024, then left in January 2026 to return to OpenAI.
- He spent only five months at OpenAI before departing in June 2026.
- Google confirmed it wants Zoph's reinforcement learning expertise applied to its Gemini AI model.
Barret Zoph has a new job. Again.
The AI researcher has joined Google as vice president of research, confirmed to the Wall Street Journal. Fourth senior role at a major AI organisation since October 2024.
How did he end up here?
Zoph left OpenAI in October 2024 after two years there, then co-founded Thinking Machines with Mira Murati, who had left OpenAI the month before. In January 2026, Zoph and fellow co-founder Luke Metz departed the startup to return to OpenAI. That didn't stick either: he spent five months heading AI enterprise sales, then left in June 2026.
Google isn't entirely new territory. He worked there before OpenAI. "We look forward to Barret returning to Google and bringing his RL and post-training expertise to Gemini," a Google spokesperson told the Wall Street Journal. RL is reinforcement learning, a technique where a model is rewarded for correct answers and penalised for wrong ones. Post-training is the fine-tuning done on a model after its initial training is complete. Gemini is Google's flagship AI model, competing directly with OpenAI's ChatGPT.
Why does this keep happening across the AI industry?
Turnover at the top of AI firms is high, and OpenAI is the clearest example. Despite readying itself for an IPO, it's lost a string of senior figures over the past eight months, from its chief operating officer to a senior executive overseeing data centres. We reported in July on Lilian Weng, another Thinking Machines co-founder, leaving and then rejoining OpenAI, so Zoph's moves fit a pattern the company knows well.
No single explanation covers every departure. Pay and creative differences both play a role. When someone of Zoph's profile moves, what travels with them, the instincts and working knowledge of a rival's systems, is exactly what companies are spending billions to acquire.
For ordinary users, the real question is whether products improve or deteriorate when the people building them move this fast. Google now has a researcher who's seen the inside of two of its closest competitors. Whether that speeds Gemini forward is worth watching.
Common questions
What is Thinking Machines, the startup Zoph co-founded?
Thinking Machines is an AI startup launched in late 2024 by Mira Murati and colleagues including Zoph. It has released open-source AI models, including one our team covered in August, though the company has shared little about its longer-term product focus.
Does Zoph's move affect Google's Gemini AI for regular users?
Not immediately. Research leadership changes take months or years to reach a finished product. His reinforcement learning background could shape how future versions of Gemini are trained, but any effect on the assistant most people use daily is a long way off.
