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Engineer · Researcher

John Rizzo

OpenAIMember of Technical Staff

Rizzo is an OpenAI engineer and core contributor to o1.[1] Before joining OpenAI in 2023, he worked on large-scale chat infrastructure at Twitch, including systems built for high-volume live communities.

Career & education

Current role
Aug 2023-present
Member of Technical Staff
Previously
Senior Software Engineer
Education

Work and education history is primarily focused on AI-relevant roles and may not be comprehensive.

References

  1. OpenAI o1 Contributionsopenai.com
About this profile

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Reviewed July 18, 2026 · Checked for accuracy and new information.

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