Began working as a research scientist at Google Brain, where his work helped popularize chain-of-thought prompting, instruction tuning, and emergent phenomena in large language models.

Joined OpenAI's research team, contributing to projects focused on large language models and AI reasoning, including work on the ChatGPT team.

Co-created the OpenAI o1 model, designed to spend more time thinking before responding to reason through complex tasks, and also contributed to deep research initiatives.

Departed OpenAI to join Meta's newly formed Superintelligence Labs, continuing his research on advanced artificial intelligence.