Liam Fedus
Researcher · Founder
Now Founder, Periodic Labs
Latest on AI4S.fyiInterview · Oct 8Periodic Labs takes its tools to chipmakers first; superconductors wait on synthesis and testingAccount links back to periodic.com · Avatar from their X account, taken 2026-09-28
Affiliations
Current
- Founder · Periodic Labs
Also named in the companies' announcements: Google Brain, OpenAI
Current roles come from these dated records, not from the bio below. Each links the page it was read from.
About
Liam Fedus is a co-founder of Periodic Labs, which builds AI systems and automated labs for physical science. He was OpenAI's vice president of research for post-training, having joined OpenAI in 2022 from Google, and investor Felicis credits him with advances in ChatGPT.
Read on 2026-09-29; for current roles see Affiliations above. Read at: felicis.com ↗ · maginative.com ↗ · periodic.com ↗
Selected work
- Switch Transformers: Scaling to Trillion Parameter Models with Simple and Efficient Sparsity ↗
A mixture-of-experts Transformer that sends each token to one expert, to add parameters at low cost.
Each byline was read on the paper itself. Only people on this record are named, not the full author list, and a shared byline does not say who did which part.
Founded
Periodic LabsMaterials and chemistry · 2025 · 2 rounds on record · disclosed $300M · Round (unnamed) at least $500 millionBackground: OpenAI (VP of research); earlier Google Brain (as the company's own announcements put it)
Co-founders: Ekin Dogus Cubuk
Interviews
- 2026-10-08Periodic Labs takes its tools to chipmakers first; superconductors wait on synthesis and testing · Latent Space
- 2026-10-01At Periodic's scale, the lab needs AI to read its own data · The Frontier with Brendan Foody (Mercor)
- 2026-09-29Periodic Labs: training an AI scientist on experimental traces, not just papers · The Generalist
On the timeline
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