Founder Directory
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Founders5
Known for these resultsRole80%Role is parsed from founder titles in yc.db. Known for 80% 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-company40%Ex-company is matched from bios with employment context (ex-, formerly, worked at). 40% of these rows have at least one match.School20%School is matched from bios, case-sensitive for acronyms. 20% of these rows have at least one match.
- Anton ZaliznyiCo-founder & Chief AI Officer · PhasesS25Healthcare · San Francisco
- James WallFounder/CEO · PhasesS25Healthcare · San Francisco
- Jonathan van WerschFounder/CTO · PhasesS25Healthcare · San Francisco
- Xin Ding@xinding33Founder/CEO · AttuneX25B2B · San Francisco
- Karen Levy@KareninKenyaFounder · No Lean SeasonW17Unspecified
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Anton ZaliznyiPhasesCo-founder & Chief AI OfficerSummer 2025HealthcareSan Francisco, United States3—James WallPhasesFounder/CEOSummer 2025HealthcareSan Francisco, United States3—Jonathan van WerschPhasesFounder/CTOSummer 2025HealthcareSan Francisco, United States3—Xin DingAttuneFounder/CEOSpring 2025B2BSan Francisco, United States3https://x.com/xinding33Karen LevyNo Lean SeasonFounderWinter 2017UnspecifiedUnknown—https://x.com/KareninKenya
Showing 1–5 of 5 founders
Jonathan van Wersch
Founder/CTO·Phases
PRIMARY INFO
RoleFounder/CTO
Team size3
BatchSummer 2025
LocationSan Francisco, United States
Company statusActive
StageEarly
BIO
Accelerating & automating clinical trials with AI agents. - Previously a software engineer at Meta, where I worked on integrating machine learning into the mobile ads manager app. - Before Meta, I was at Improbable, a UK unicorn, where I helped scale the web platform team from 3 to 20 engineers. - I hold a bachelors and masters in mechanical engineering from the University of Bath, where I was project manager and engineering lead for the university's rocket team.
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
PhasesAutomated clinical trial oversight and execution
