Google shook up its artificial intelligence leadership on Wednesday, with Demis Hassabis stepping down as CEO of Google DeepMind to become chairman and chief scientist of parent company Alphabet, while longtime chief scientist Jeff Dean departed after 27 years to launch his own AI startup. The leadership reshuffle sent Alphabet shares down about 4% as investors reacted to the departure of key AI talent.
Hassabis, a Nobel Prize recipient who co-founded DeepMind, said in a note to employees that he decided “now is the right time for me to hand over my day-to-day operational responsibilities at GDM, so that I have the time and space to focus on the big picture.” He will remain involved in strategic and global matters related to AI while focusing on longer-term research projects and his work with Isomorphic Labs, a DeepMind spin-off focused on using AI to accelerate drug discovery.
Google DeepMind’s chief technology officer Koray Kavukcuoglu is being promoted to lead the AI division as senior vice president, where he will oversee the development of Gemini 4, the company’s next major AI model, and report directly to CEO Sundar Pichai.
Dean’s departure represents a significant loss for Google. The 58-year-old engineer has been credited with some of Google’s most important technical breakthroughs and helped build the company’s foundational AI infrastructure. He is leaving on friendly terms, with Alphabet committing to invest in his new venture. Dean will serve as CEO of Discovery Loop, a public benefit corporation focused on AI for science and engineering, alongside fellow Google veterans Sanjay Ghemawat, Oriol Vinyals, and Quoc Le.
CEO Sundar Pichai said in a blog post that Dean is leaving “at a moment where he wants to try something new,” and that the team will work to “accelerate discoveries” in machine learning, science and engineering. “After an incredible 27-year run, Jeff Dean is at a moment where he wants to try something new, and we’re excited to support him in that,” Pichai wrote.
The leadership changes come as Google navigates an intensely competitive AI landscape, competing against OpenAI and Anthropic while managing massive capital expenditures. In the second quarter of 2026, Google turned cash flow negative for the first time on record due to its capital spending, while forecasting full-year capital expenditures of up to $205 billion. Despite these challenges, Google’s cloud division has been expanding rapidly, with cloud revenue soaring 82% in Q2 to $24.8 billion, driven largely by demand for AI infrastructure and the company’s custom tensor processing units.
Hassabis’s transition from operational leadership reflects a broader industry trend where founders and pioneering researchers seek to focus on longer-term research and innovation rather than day-to-day management. When he merged Google’s two AI labs—Silicon Valley-based Google Brain and London-based DeepMind—in 2023, Hassabis took the helm of the combined organization, overseeing nearly all of Alphabet’s foundational AI work. His shift to a strategic advisory role signals that Google is prioritizing operational efficiency and model development under new leadership.
Sources
- CNBC — Reported that Alphabet shares fell about 4% after the announcement, with Jeff Dean leaving after 27 years and Hassabis moving to chairman role.
- Reuters — Confirmed that Hassabis becomes chief scientist and relinquishes DeepMind CEO role, with Jeff Dean and other key engineers leaving to found Discovery Loop.
- The New York Times — Reported that Hassabis is stepping down from day-to-day operations, with Koray Kavukcuoglu taking over as senior vice president, and provided context on the 2023 merger of Google Brain and DeepMind.
- Washington Post — Noted that Hassabis will focus his time on using AI for scientific breakthroughs, such as creating new pharmaceutical drugs.
- GeekWire — Reported that Discovery Loop is a startup automating scientific discovery, with Dean expected to serve as CEO.
