What Happened to Noam Shazeer?
Noam Shazeer is a pioneering computer scientist and entrepreneur renowned for his foundational contributions to artificial intelligence, most notably co-inventing the Transformer architecture. After a significant career at Google, he co-founded Character.AI, a successful conversational AI platform, before returning to Google in 2024 to co-lead the Gemini AI project. As of June 2026, Shazeer has announced his departure from Google to join OpenAI.
Quick Answer
Noam Shazeer, a key figure in modern AI, co-authored the seminal "Attention Is All You Need" paper in 2017, introducing the Transformer architecture. He left Google in 2021 to co-found Character.AI, a popular generative AI chatbot service. In August 2024, Google licensed Character.AI's technology for $2.7 billion, bringing Shazeer back to co-lead their flagship Gemini AI project. Most recently, in June 2026, it was reported that Shazeer is leaving Google to join OpenAI, marking another significant shift in his influential career.
📊Key Facts
📅Complete Timeline13 events
Born in Philadelphia, Pennsylvania
Noam Shazeer was born in Philadelphia, Pennsylvania, in 1975 or 1976.
Joined Google
Shazeer began his career at Google, where he would spend over two decades contributing to various projects.
Improved Google's Spelling Corrector
One of his early significant achievements at Google was improving the search engine's spelling corrector.
Co-invented Sparsely-gated Mixture of Experts
Shazeer co-invented the Sparsely-gated Mixture of Experts, a technique for scaling neural networks.
Co-authored 'Attention Is All You Need' paper
Shazeer was a lead author on the seminal paper that introduced the Transformer architecture, fundamentally changing deep learning for natural language processing.
Co-invented Mesh-Tensorflow
He co-invented Mesh-Tensorflow, a system for training giant Transformers on supercomputers.
Left Google to co-found Character.AI
Frustrated by Google's decision not to release his Meena chatbot, Shazeer left the company with Daniel de Freitas to establish Character.AI.
Character.AI raises $150M Series A funding, valued at $1B
Character.AI secured $150 million in Series A funding, achieving a valuation of approximately $1 billion.
Named one of Time Magazine's 100 Most Influential People in AI
Time Magazine recognized Noam Shazeer for his significant impact on the field of artificial intelligence.
Google licenses Character.AI tech for $2.7B; Shazeer returns to co-lead Gemini
Google entered a $2.7 billion agreement to license Character.AI's technology, leading to Shazeer's return to Google as a co-lead for the Gemini AI project.
Elected member of the National Academy of Engineering
Noam Shazeer was elected as a member of the National Academy of Engineering, a prestigious recognition of his contributions to the field.
Character.AI reported at $5 billion valuation
Character.AI's valuation was reported to have reached $5 billion, reflecting its significant user engagement and market position.
Leaves Google to join OpenAI
Noam Shazeer announced his departure from Google, where he co-led the Gemini project, to join OpenAI, marking a major talent shift in the AI industry.
🔍Deep Dive Analysis
Noam Shazeer's career has been marked by a series of groundbreaking contributions to artificial intelligence, fundamentally shaping the landscape of natural language processing. He joined Google in 2000, where his early work included improving the search engine's spelling corrector and developing the PHIL algorithm for Google AdSense. His most impactful work at Google culminated in the 2017 paper "Attention Is All You Need," which introduced the Transformer architecture. This novel neural network, based solely on attention mechanisms, revolutionized sequence transduction models by enabling greater parallelization and improved performance over traditional recurrent or convolutional networks. The Transformer became the foundational technology for virtually all major large language models (LLMs) that followed, including OpenAI's GPT series and Google's own models.
In the years following the Transformer's publication, Shazeer and his colleague Daniel de Freitas developed an advanced chatbot named Meena at Google. However, Google's reluctance to publicly release the chatbot due to safety and fairness concerns led Shazeer and de Freitas to depart the company in 2021. They subsequently co-founded Character.AI in November 2021, a generative AI chatbot service allowing users to create and interact with customizable AI characters. Character.AI quickly gained traction, raising $150 million in Series A funding in March 2023 at a $1 billion valuation. By April 2026, some reports indicated its valuation had reached $5 billion, serving hundreds of millions of users globally.
A significant turning point occurred in August 2024 when Google struck a $2.7 billion deal to license Character.AI's generative AI technology. This agreement included provisions for Shazeer and de Freitas, along with several Character.AI employees, to return to Google. Shazeer, who reportedly owned 30-40% of Character.AI, netted an estimated $750 million to $1 billion from this deal. Upon his return, Shazeer was appointed as a co-lead for Google's ambitious Gemini AI project, alongside Jeff Dean and Oriol Vinyals, underscoring Google's strategic move to re-acquire top AI talent. In early 2026, his continued influence in the field was recognized with his election as a member of the National Academy of Engineering.
However, the latest development, reported on June 18, 2026, is that Noam Shazeer is leaving Google to join OpenAI. This move represents a major talent shift in the highly competitive AI industry, as one of the architects of the foundational Transformer architecture transitions to a key competitor in the race for advanced AI. The implications of this departure are significant, potentially reshaping the competitive dynamics between Google and OpenAI.
What If...?
Explore alternate histories. What if Noam Shazeer made different choices?