Founder Directory
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Founders6
Known for these resultsRole67%Role is parsed from founder titles in yc.db. Known for 67% 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.Bio67%Bio coverage: 67% 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-company33%Ex-company is matched from bios with employment context (ex-, formerly, worked at). 33% of these rows have at least one match.School67%School is matched from bios, case-sensitive for acronyms. 67% of these rows have at least one match.
- Edward HinsonFounder · Zephyr FusionF25Industrials · San Diego
- Galen BurkeFounder · Zephyr FusionF25Industrials · San Diego
- Jason KaufmannFounder/CTO · Maritime FusionW25Industrials · San Francisco
- Justin CohenFounder/CEO · Maritime FusionW25Industrials · San Francisco
- Chris PihlFounder/CTO · Helion EnergyS14Industrials · Seattle
- David Kirtley@dekirtleyFounder/CEO · Helion EnergyS14Industrials · Seattle
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Edward HinsonZephyr FusionFounderFall 2025IndustrialsSan Diego, United States2—Galen BurkeZephyr FusionFounderFall 2025IndustrialsSan Diego, United States2—Jason KaufmannMaritime FusionFounder/CTOWinter 2025IndustrialsSan Francisco, United States6—Justin CohenMaritime FusionFounder/CEOWinter 2025IndustrialsSan Francisco, United States6—Chris PihlHelion Energy2× YCFounder/CTOSummer 2014IndustrialsSeattle, United States150—David KirtleyHelion EnergyFounder/CEOSummer 2014IndustrialsSeattle, United States150https://x.com/dekirtley
Showing 1–6 of 6 founders
Justin Cohen
Founder/CEO·Maritime Fusion
PRIMARY INFO
RoleFounder/CEO
Team size6
BatchWinter 2025
LocationSan Francisco, United States
Company statusActive
StageEarly
BIO
Nuclear engineer and plasma physicist working on fusion reactors for defense and commercial shipping applications. Previously Tesla, SpaceX, Columbia University, Princeton Plasma Physics Laboratory, NC State.
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
Maritime Fusion
Fusion reactors for ships
IndustryIndustrials
Websitemaritimefusion.com
Team size6
LocationSan Francisco, United States
BatchWinter 2025
Co-foundersJason Kaufmann
