Founder Directory
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Founders2
Known for these resultsRole100%Role is parsed from founder titles in yc.db. Known for 100% of these rows — the rest have no title at all, mostly 2019–2023. Those rows stay in the result and are counted as Unknown, never as No.Bio100%Bio coverage: 100% of these founders have a bio on their YC profile. Every bio-derived facet (ex-company, school, credentials, discipline) is Unknown for the rest.Ex-company50%Ex-company is matched from bios with employment context (ex-, formerly, worked at). 50% of these rows have at least one match.School0%School is matched from bios, case-sensitive for acronyms. 0% of these rows have at least one match.
- Jackson StokesFounder/CEO · TrainLoopW25B2B · San Francisco
- Mason Pierce@mlpierce22Founder/CTO · TrainLoopW25B2B · San Francisco
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Jackson StokesTrainLoopFounder/CEOWinter 2025B2BSan Francisco, United States6—Mason PierceTrainLoopFounder/CTOWinter 2025B2BSan Francisco, United States6https://x.com/mlpierce22
Showing 1–2 of 2 founders
Jackson Stokes
Founder/CEO·TrainLoop
PRIMARY INFO
RoleFounder/CEO
Team size6
BatchWinter 2025
LocationSan Francisco, United States
Company statusActive
StageEarly
BIO
Cofounder at TrainLoop, previously Google Gemini & AlphaFold performance
Ex-company, school and discipline below are derived from this bio. Nothing is inferred when the bio is missing.
BACKGROUND
Credentialsnone mentioned
Disciplinenot detectedKeyword match from the bio text, not a classifier.
TRACK RECORD
First YC company on record
COMPANY CONTEXT
TrainLoopReasoning Fine-Tuning
Co-foundersMason Pierce@mlpierce22
