person
Lewis Tunstall
Hugging Face; LLM post-training
Researcher at Hugging Face; co-author of multiple Hugging Face textbooks and lead developer of TRL (Transformer Reinforcement Learning) and post-training tooling for open models.
current Research Scientist, Hugging Face
Strategy positions
Open sourceendorses
Release weights widely; transparency beats closed safetyArgues open post-training tooling is a precondition for the open-source AI ecosystem to keep pace with frontier labs; built TRL and DPO/PPO scaling primitives toward this end.
If RLHF is opaque and proprietary, the open-source ecosystem is locked out of the most important phase of model development. Building open post-training tooling is the answer.
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Record last updated 2026-04-25.