Startups

Hassabis exits DeepMind CEO role as Jeff Dean leaves Google to launch Discovery Loop

Alphabet's AI leadership is reshuffling on the same day a 27-year veteran walks out with three colleagues to start a Google-backed AI-for-science company.

By Giulia Donatello · Startups & funding · 2026-08-06 · 3 min read

Alphabet overhauled the top of its AI organization on Wednesday, and the market read it as a loss: shares fell roughly 5% after Jeff Dean, employee number 30 and the company’s chief scientist since 1999, walked out after 27 years to co-found a startup with three DeepMind and Brain colleagues. On the same day, Demis Hassabis stepped down as CEO of Google DeepMind, taking a new chairman role and the newly minted title of chief scientist of Alphabet.

The choreography is doing a lot of work. Hassabis’s internal memo frames the shift as a chance to spend more time at Isomorphic Labs, Alphabet’s AI drug discovery unit, and gestures toward progress on the unreleased Gemini 4. Koray Kavukcuoglu, previously DeepMind’s CTO and Alphabet’s chief AI architect, takes over daily operations as SVP of Google DeepMind, reporting to Sundar Pichai. It’s the tidiest possible version of a story that isn’t tidy.

The untidy version: Gemini 3.5 Pro is months past its June target, Axios attributes part of the delay to low morale, and Alphabet has been shedding senior AI talent for a while now. Gemini co-lead Noam Shazeer went to OpenAI. Nobel laureate John Jumper went to Anthropic. Dean’s exit isn’t an isolated defection; it’s the loudest data point in an ongoing pattern.

Dean’s new company, Discovery Loop, is being structured as a public benefit corporation with Sanjay Ghemawat, Quoc Le (a Google Brain founding member), and DeepMind’s Oriol Vinyals. Its pitch is AI-accelerated science: algorithms that initiate and iterate on thousands of experiments simultaneously. “We think there is opportunity for AI to more fully automate what has traditionally been a very human-intensive experimental loop,” Dean told The New York Times. The PBC structure, he added, would let the company “make decisions that are not necessarily in the company’s purist financial interests.”

The funding round is co-led by Radical Ventures and Khosla Ventures, with Kleiner Perkins, Lightspeed, and Doerr Capital participating. Google itself is an investor and the cloud provider.

Which is the part that locates this event historically. The Xerox PARC playbook was that the parent company failed to capture its own researchers’ upside. Alphabet, watching Dean leave, has written itself onto the cap table and the invoice.

Sources