Founder Directory
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Founders24
Known for these resultsRole38%Role is parsed from founder titles in yc.db. Known for 38% 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.Bio92%Bio coverage: 92% 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-company29%Ex-company is matched from bios with employment context (ex-, formerly, worked at). 29% of these rows have at least one match.School46%School is matched from bios, case-sensitive for acronyms. 46% of these rows have at least one match.
- Hisham El-HalabiFounder/CTO · Vernius Systems, Inc.S26Industrials · San Francisco
- David Lee@dleebuildsFounder · AndcoX26B2B · San Francisco
- Tony Gao@togao0Founder/CEO · FuchsiaX26B2B · San Francisco
- Shipra JhaFounder/CTO · CorelayerW26B2B · San Francisco
- Assem Chammah@achammah1Founder/CEO · NexusF25B2B · Brussels
- Vihaar Nandigala@VihaarNandigalaFounder/CEO · Orange SliceS25B2B · San Francisco
- Leon HergertFounder/CEO · SpherecastS24B2B · San Francisco
- Pascal SchindlerFounder/CTO · SpherecastS24B2B · San Francisco
- Paul DietrichFounder/CPO · SpherecastS24B2B · San Francisco
- Jacob CaccamoFounder · Ora AIS23Education · San Francisco
- Kevin BastoulFounder · Ora AIS23Education · San Francisco
- Ryan Phelps@ryan_rl_phelpsFounder · Ora AIS23Education · San Francisco
- Buddha Chaudhuri@buddhachaudhuriFounder · KeylikaS22Healthcare · San Francisco
- Frederik CeyssensFounder · KeylikaS22Healthcare · San Francisco
- Mokshith Voodarla@mokshith_vFounder · SieveW22B2B · San Francisco
- Alla ArzumanyanFounder · SFA TherapeuticsS21Healthcare · Philadelphia
- Ira SpectorFounder · SFA TherapeuticsS21Healthcare · Philadelphia
- Mark Feitelson@feitelsonFounder · SFA TherapeuticsS21Healthcare · Philadelphia
- Ahmed AbuelenienFounder · peopleCQW21Fintech · Cairo
- Mostafa AshourFounder · peopleCQW21Fintech · Cairo
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Hisham El-HalabiVernius Systems, Inc.Founder/CTOSummer 2026IndustrialsSan Francisco, United States3—David LeeAndcoFounderSpring 2026B2BSan Francisco, United States3https://x.com/dleebuildsTony GaoFuchsiaFounder/CEOSpring 2026B2BSan Francisco, United States3https://x.com/togao0Shipra JhaCorelayerFounder/CTOWinter 2026B2BSan Francisco, United States3—Assem ChammahNexusFounder/CEOFall 2025B2BBrussels, Belgium2https://x.com/achammah1Vihaar NandigalaOrange SliceFounder/CEOSummer 2025B2BSan Francisco, United States2https://x.com/VihaarNandigalaLeon HergertSpherecastFounder/CEOSummer 2024B2BSan Francisco, United States7—Pascal SchindlerSpherecastFounder/CTOSummer 2024B2BSan Francisco, United States7—Paul DietrichSpherecastFounder/CPOSummer 2024B2BSan Francisco, United States7—Jacob CaccamoOra AIFounderSummer 2023EducationSan Francisco, United States3—Kevin BastoulOra AIFounderSummer 2023EducationSan Francisco, United States3—Ryan PhelpsOra AIFounderSummer 2023EducationSan Francisco, United States3https://x.com/ryan_rl_phelpsBuddha ChaudhuriKeylikaFounderSummer 2022HealthcareSan Francisco, United States1https://x.com/buddhachaudhuriFrederik CeyssensKeylikaFounderSummer 2022HealthcareSan Francisco, United States1—Mokshith VoodarlaSieveFounderWinter 2022B2BSan Francisco, United States34https://x.com/mokshith_vAlla ArzumanyanSFA TherapeuticsFounderSummer 2021HealthcarePhiladelphia, United States4—Ira SpectorSFA TherapeuticsFounderSummer 2021HealthcarePhiladelphia, United States4—Mark FeitelsonSFA TherapeuticsFounderSummer 2021HealthcarePhiladelphia, United States4https://x.com/feitelsonAhmed AbuelenienpeopleCQFounderWinter 2021FintechCairo, Egypt85—Mostafa AshourpeopleCQFounderWinter 2021FintechCairo, Egypt85—
Showing 1–20 of 24 founders
Frederik Ceyssens
Founder·Keylika
PRIMARY INFO
RoleFounder· not in title
Team size1
BatchSummer 2022
LocationSan Francisco, United States
Company statusActive
StageEarly
BIO
With a deep passion for diverse technologies, Frederik is truly a multi-domain expert. From tiny moving machines to nuclear space rockets, and electrical circuits to medical devices – Frederik has pursued an illustrious scientific career over the last 15 years developing key microtechnologies for lifescience applications. He also founded a venture-backed neurotech startup to cure blindness. Frederik holds a PhD and a Masters in IC design as well as a Bachelors' in Medicine.
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.
CredentialsPhD
DisciplineResearcherKeyword match from the bio text, not a classifier.
TRACK RECORD
First YC company on record
COMPANY CONTEXT
KeylikaRedefining the Standard of Care for Iron Deficiency Anemia
Co-foundersBuddha Chaudhuri@buddhachaudhuri
