Founder Directory
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Founders70
Known for these resultsRole31%Role is parsed from founder titles in yc.db. Known for 31% 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.Bio81%Bio coverage: 81% 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-company20%Ex-company is matched from bios with employment context (ex-, formerly, worked at). 20% of these rows have at least one match.School26%School is matched from bios, case-sensitive for acronyms. 26% of these rows have at least one match.
- Thomas ChanFounder/CEO · Lantern AIF26B2B · San Francisco
- Thomas PerezFounder/COO · COACHS26B2B · San Francisco
- Thomas Boser@thomasboserFounder/CTO · hiloopS26B2B · San Francisco
- Thomas LanningFounder/CEO · Lamb LabsS26B2B · London
- Thomas Aubry@ThomAubFounder/CTO · Ooak DataS26B2B · San Francisco
- Haithem Kchaou@haithemkchaouFounder/CEO · Callab AIX26B2B · San Francisco
- Human Thomas@madebythomasaiFounder/CEO · ThomasX26B2B · San Francisco
- Joseph Thomas@josephpthomasFounder · ForumW26Fintech · New York
- Thomas Dowling@thetomdowlingFounder/CEO · FullSeamW26B2B
- Thomas DohertyFounder · MillirayW26Industrials · London
- Thomas Cesare-HerriauFounder/CTO · SpotPayW26Fintech · San Francisco
- Patrick FayFounder/CTO · MagneticS25B2B · San Francisco
- Thomas Shelley@tsh3llFounder/CEO · MagneticS25B2B · San Francisco
- Thomas CrochetFounder · BlaxelX25B2B · San Francisco
- Thomas RapillyFounder/CTO · Moby AnalyticsX25B2B · Paris
- Thomas Liao@distributionatFounder/CEO · neoncoralX25Consumer · San Francisco
- Thomas Minassian@thminassianFounder/CEO · DollyglotW25Consumer · Paris
- Shane Thomas@smthomas3Founder · MastraW25B2B · San Francisco
- Thomas BlakeFounder/CTO · MatchaF24Healthcare · New York
- thomas hallaranFounder/CTO · Capitol AIS24B2B · Washington
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Thomas ChanLantern AIFounder/CEOFall 2026B2BSan Francisco, United States4—Thomas PerezCOACHFounder/COOSummer 2026B2BSan Francisco, United States4—Thomas BoserhiloopFounder/CTOSummer 2026B2BSan Francisco, United States2https://x.com/thomasboserThomas LanningLamb LabsFounder/CEOSummer 2026B2BLondon, United Kingdom0—Thomas AubryOoak DataFounder/CTOSummer 2026B2BSan Francisco, United States5https://x.com/ThomAubHaithem KchaouCallab AIFounder/CEOSpring 2026B2BSan Francisco, United States7https://x.com/haithemkchaouHuman ThomasThomasFounder/CEOSpring 2026B2BSan Francisco, United States2https://x.com/madebythomasaiJoseph ThomasForumFounderWinter 2026FintechNew York, United States2https://x.com/josephpthomasThomas DowlingFullSeam2× YCFounder/CEOWinter 2026B2BUnknown3https://x.com/thetomdowlingThomas DohertyMillirayFounderWinter 2026IndustrialsLondon, United Kingdom3—Thomas Cesare-HerriauSpotPayFounder/CTOWinter 2026FintechSan Francisco, United States2—Patrick FayMagneticFounder/CTOSummer 2025B2BSan Francisco, United States10—Thomas ShelleyMagneticFounder/CEOSummer 2025B2BSan Francisco, United States10https://x.com/tsh3llThomas CrochetBlaxelFounderSpring 2025B2BSan Francisco, United States8—Thomas RapillyMoby AnalyticsFounder/CTOSpring 2025B2BParis, France4—Thomas LiaoneoncoralFounder/CEOSpring 2025ConsumerSan Francisco, United States1https://x.com/distributionatThomas MinassianDollyglotFounder/CEOWinter 2025ConsumerParis, France2https://x.com/thminassianShane ThomasMastraFounderWinter 2025B2BSan Francisco, United States30https://x.com/smthomas3Thomas BlakeMatchaFounder/CTOFall 2024HealthcareNew York, United States2—thomas hallaranCapitol AIFounder/CTOSummer 2024B2BWashington, United States11—
Showing 1–20 of 70 founders
Geoff Segal
Founder/President·FullSeam
PRIMARY INFO
RoleFounder/President
Team size3
BatchWinter 2026
Location
Company statusActive
StageEarly
BIO
Geoff is the co-founder of FullSeam (W26), the AI employee for finance and accounting teams. He previously co-founded TaxProper (S19), the leading property tax software for institutional real estate investors, which successfully exited to Opendoor (NASDAQ: OPEN) in 2022.
Ex-company, school and discipline below are derived from this bio. Nothing is inferred when the bio is missing.
BACKGROUND
No notable employer or school mentioned in the bio.
Credentialsnone mentioned
DisciplineEngineerKeyword match from the bio text, not a classifier.
TRACK RECORD
2× YC founderVerified prior exitSerial founder · self-declaredExit mentioned in bio
- S19TaxProperAcquired
- W26FullSeamActive · this entry
COMPANY CONTEXT
FullSeamAI agents for corporate accounting teams
