Founder Directory
Built by Keitoto
Founders7
Known for these resultsRole29%Role is parsed from founder titles in yc.db. Known for 29% 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-company100%Ex-company is matched from bios with employment context (ex-, formerly, worked at). 100% of these rows have at least one match.School57%School is matched from bios, case-sensitive for acronyms. 57% of these rows have at least one match.
- Samuel HahnFounder/COO · PetrarchS26B2B · San Francisco
- Chalmers Brown@chalmers_brownFounder/CEO · JarminF25B2B · San Francisco
- Jose Luis Perez@joseleperezFounder · TrackingplanW22B2B · Barcelona
- Valerio MagliuloFounder · AbatableS21Industrials · London
- Jonathan Baker@Jon_M_BakerFounder · AlgoViralS21B2B · London
- Martin Sosic@martinsosicFounder · WaspW21B2B · Zagreb
- David Klein@kleintechFounder · ParadeS20B2B · Seattle
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Samuel HahnPetrarchFounder/COOSummer 2026B2BSan Francisco, United States3—Chalmers BrownJarminFounder/CEOFall 2025B2BSan Francisco, United States5https://x.com/chalmers_brownJose Luis PerezTrackingplanFounderWinter 2022B2BBarcelona, Spain17https://x.com/joseleperezValerio MagliuloAbatableFounderSummer 2021IndustrialsLondon, United Kingdom35—Jonathan BakerAlgoViralFounderSummer 2021B2BLondon, United Kingdom5https://x.com/Jon_M_BakerMartin SosicWaspFounderWinter 2021B2BZagreb, Croatia2https://x.com/martinsosicDavid KleinParadeFounderSummer 2020B2BSeattle, United States5https://x.com/kleintech
Showing 1–7 of 7 founders
Ian Lee
Founder/CEO·Petrarch
PRIMARY INFO
RoleFounder/CEO
Team size3
BatchSummer 2026
LocationSan Francisco, United States
Company statusActive
StageEarly
BIO
Founder at Petrarch. Previously Fellow at Meridian AI building training data and GTM infrastructure for AI-native Excel in financial services. Technical Advisor at Scale AI, working on quality filtering and annotation for agentic assistants and reasoning models. BA in Applied Mathematics and Psychology from Harvard.
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
PetrarchInternal industrial company data for frontier labs
