$25
Jersey Tee · from
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Why #0
Switch Transformers: it's either on or off. He got the 0. Joke number.
Coming soonSeries 1 · Card 181/211
The trading card
Every player in the league gets a card. The front shows the kit and the back has the stat line: transfer history, scouting report and the story behind the number. Tap it to flip it over.
Printed cards aren't on sale yet. They're coming as random packs and team packs.
See the full setScouting report
Known for
- 01First author of Switch Transformers
- 02Former VP of Post-Training at OpenAI; part of the ChatGPT team
- 03Co-founded Periodic Labs (2025)
Transfer history
Google Brain
2022–2025
OpenAI
2025–now
Periodic Labs
Current club
Fact check
Receipts
Every fact on this page, with a link. Data as of 2026-10. Spot something stale? Tell us.
- Current X bio: 'Building industrial-scale science at @periodiclabs. Past: VP of Post-Training @OpenAI; Google Brain' (mirrored, fetched 2026-10)digg.com ↗ (opens in a new tab)
- Switch Transformers paper, first author (as William Fedus)arxiv.org ↗ (opens in a new tab)
- Switch Transformer, ChatGPT, OpenAI VP post-training, Periodic Labs cofounder (Sept 2025)en.wikipedia.org ↗ (opens in a new tab)
