Four Google AI Researchers Exit After 27 Years to Form Discovery Loop

Jeff Dean, Google's chief scientist and one of the most influential engineers in the company's history, is leaving after 27 years with three other top AI researchers to form Discovery Loop, a startup that aims to automate scientific discovery — a departure that deepens Alphabet's talent drain in the AI race.

"We think there is opportunity for AI to more fully automate what has traditionally been a very human-intensive experimental loop," Dean said in an interview at his Silicon Valley home. "You will get both a higher quantity and a higher quality of experiments, and that will lead to scientific breakthroughs and advances."

Dean, Google's 30th employee who joined in 1999, will be chief executive of Discovery Loop, a public-benefit corporation backed by Khosla Ventures and Radical Ventures. The co-founders — Sanjay Ghemawat, Oriol Vinyals and Quoc V. Le — helped build Google's search infrastructure, Google Brain and the Gemini model.

The startup joins a growing list of ventures chasing recursive self-improvement, where AI improves itself with little human help, with applications spanning drug discovery, chip design and materials science. Google will take a stake in the company and provide compute power for its first year.

A Talent Exodus at a Critical Moment

The departures strike at Alphabet as it races to keep pace in the AI model competition against OpenAI, Anthropic and Meta. Dean and Ghemawat, among the company's first hires, wrote significant parts of the computing and search infrastructure that underpins Google's business. Vinyals served as vice president of research at DeepMind and a technical lead for Gemini, while Le co-founded Google Brain and led the AutoML-Zero project, which uses machine learning to build AI products autonomously.

Alphabet CEO Sundar Pichai tried over multiple meetings to keep the four, Dean said. "In a large organization there is always a lot of inertia you have to overcome to make any radical changes," Vinyals said. "We want to build something different."

Pichai said in a statement that Google would continue to work with Discovery Loop as a founding investor and Cloud partner.

The Mission: AI as the Researcher

Discovery Loop's goal is to build AI that can run thousands of automated experiments — proposing, implementing, evaluating and learning from results without human intervention. The company will be its own first customer, directing the autonomous loops toward improving its own machine learning algorithms before expanding to other domains.

"Humans have been using AI to do research, not using AI to be a researcher," said Vinod Khosla, whose firm backed the venture. "The fundamental thing is that AI is the researcher."

The founders have not disclosed the funding amount or valuation. But the backing shows continued venture appetite for AI talent: some companies have paid tens or even hundreds of millions for a single AI superstar, and these four are among the most decorated in the field.

What's at Stake for Investors

The exodus raises questions about Alphabet's ability to retain top AI talent as competition for researchers intensifies. Alphabet shares fell after reports of further AI talent departures, according to the Wall Street Journal. Meanwhile, Discovery Loop's success could reshape competition in drug discovery and chip design, areas where Nvidia, OpenAI and others are also investing heavily.

For investors, the key question is whether Discovery Loop's work will be as significant as the talent gap it creates at Google. The startup has not yet hired a team or rented office space, meaning more defections from Google could follow.

This article is for informational purposes only and does not constitute investment advice.