Founder Directory
Built by Keitoto
Founders5
Known for these resultsRole60%Role is parsed from founder titles in yc.db. Known for 60% 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.School40%School is matched from bios, case-sensitive for acronyms. 40% of these rows have at least one match.
- Rhys Sullivan@RhysSullivanFounder · ExecutorS26B2B · San Francisco
- Christopher Burns@burnedchrisFounder/CEO · InthX26B2B · San Francisco
- Ethan Shea@ethsheaFounder/CTO · RegbaseX26B2B · New York
- Rob Pruzan@RobKnight__Founder/CEO · ZenbuX26B2B · San Francisco
- Fernando Rojo@fernandotherojoFounder · BasementW19Consumer · New York
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Rhys SullivanExecutorFounderSummer 2026B2BSan Francisco, United States1https://x.com/RhysSullivanChristopher BurnsInthFounder/CEOSpring 2026B2BSan Francisco, United States3https://x.com/burnedchrisEthan SheaRegbaseFounder/CTOSpring 2026B2BNew York, United States3https://x.com/ethsheaRob PruzanZenbuFounder/CEOSpring 2026B2BSan Francisco, United States1https://x.com/RobKnight__Fernando RojoBasementFounderWinter 2019ConsumerNew York, United States2https://x.com/fernandotherojo
Showing 1–5 of 5 founders
Ethan Shea
Founder/CTO·Regbase
PRIMARY INFO
RoleFounder/CTO
Team size3
BatchSpring 2026
LocationNew York, United States
Company statusActive
StageEarly
BIO
Founder/CTO at Regbase- Automating Corporate Compliance Worldwide Previously I was a staff engineer at Vercel, where I built the observability backend and the first Vercel Agent. Before that I worked at Citadel where my team maintained the firm's master list of everything that can be traded. I grew up in Seattle and went to the University of Washington.
Ex-company, school and discipline below are derived from this bio. Nothing is inferred when the bio is missing.
BACKGROUND
Credentialsnone mentioned
DisciplineEngineerKeyword match from the bio text, not a classifier.
TRACK RECORD
First YC company on record
COMPANY CONTEXT
Regbase
Automating Corporate Compliance, Worldwide
Co-foundersNatalie Aresta-Katz
