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🦊/People

Justin Butler

InvestorFounder

Partner at Eclipse Ventures

San Francisco Bay Area

Writes $200K – $5M checks · typically $2.5M

FoundedNucleusrad

Find your path to Justin

324 people in our graph share verified history with Justin — schools, employers, funds. One of them is your warm intro.

Joanne ChenunlockedJustin: together at Safely You (2021–2025)

Justin: together at MIT Sloan School of Management

×2Justin: together at Rune Labs

×2Justin: together at UC Santa Barbara

Contact· self-published, not guessed

j•••@eclipse.vcreveal

Experience

StealthBuildingcurrent2026 — present
American Cancer SocietyBoard Membercurrent2026 — present
Capstan MedicalBoard Membercurrent2023 — presentSanta Cruz, California, United States
Nucleus RadiopharmaBoard Member, Foundercurrent2022 — present
Kathryn Butler FoundationFoundercurrent2017 — present
Watchmaker GenomicsBoard Observer2022 — 2025
Rune LabsBoard Member2021 — 2025
SafelyYouBoard Member2021 — 2025
CellaresBoard Member2019 — 2025
EclipsePartner2015 — 2025Palo Alto, California
SpellBoard Member2018 — 2022
Misfit WearablesVP, Commercial Development2013 — 2015San Francisco Bay Area
Synthetic GenomicsDirector of Business Development2011 — 2013La Jolla, CA
DuPontProcess Engineer2007 — 2009
Gas Reaction TechnologiesChemical Engineer2007

Skills & more

Product Development76Research24Business Development73Entrepreneurship99Strategic Planning50

From Justin's professional profile.

Colleagues at Eclipse Ventures

Aidan Madigan-Curtis

Partner at Eclipse Ventures

Allyson Johnson

Partner at Eclipse Ventures

Venture Partner at Eclipse Ventures

Partner and Head of Strategy at Eclipse Ventures

Partner at Eclipse Ventures

Senior Executive Assistant and Events Coordinator at Eclipse Ventures

Director of Community Operations at Eclipse Ventures

VP of Marketing at Eclipse Ventures

Frequently asked questions

Who is Justin Butler?: Partner at Eclipse Ventures
Where does Justin Butler work?: Justin Butler is Co-founder & Board Chair of Nucleusrad and Partner at Eclipse Ventures.
What check size does Justin Butler write?: Justin Butler typically writes checks of $200K – $5M.
What companies did Justin Butler found?: Justin Butler founded Nucleusrad.
Where did Justin Butler go to school?: Justin Butler studied at MIT Sloan School of Management (MBA); UC Santa Barbara (Bachelor of Science, Chemical Engineering).

Founder mafias

MIT Sloan School of Management mafia327

Also came through, then founded or led a company.

Hemant TanejaS.M.Founded Hippocratic AI Brad FeldS.M.Founded Techstars Gleb ChuvpiloFinancial Technology Option (FTO)Founded Thor Directed Energy +6 Natan LinderExecutive Education.Founded Tulip Interfaces +2 AjayM.B.A.Founded Timescale +2 David AuerbachMBAFounded Circular Impact +2

+ 320 more

UC Santa Barbara mafia179

Also came through, then founded or led a company.

Logan GreenBAFounded Lyft Nils ReggeBAFounded Developx +2 Michael WitzbaFounded Mob Science +2 Zheng XuPh.D.Founded SolarCity +1 Anita KhamvongsaBachelor of Arts (B.A.)Founded Venbrook +1 David J. PhillipsB.A.Founded Fondo +1

+ 172 more

Syntheticgenomics mafia6

Also came through, then founded or led a company.

David Y. LightMolecular Biology ConsultantFounded Valisure Enterprises +1 LESLIE A HICKLEBusiness Development LeadFounded Farmsense Nathaniel WangHead of RNA Medicines Business UnitFounded Replicate Bioscience Daniel G. GibsonVice President, DNA TechnologyFounded Telesis Bio Imad AjjawiGenomics Lead - Algal BiofuelsFounded Rybodyn

Eclipse Ventures mafia3

Also came through, then founded or led a company.

Lior SusanFounder and CEOFounded Eclipse +1 Toby KrausEntrepreneur In ResidenceFounded Lightship

Safely You mafia3

Also came through, then founded or led a company.

Geordie GrahamProduct ManagerFounded Ruta Health Derek R. ZhangPrincipal Product ManagerFounded Ruta Health

Same school

Also attended MIT Sloan School of Management831

Doug LeonePartner at Sequoia Capital; former Global Managing Partner Hemant TanejaCEO & Managing Director of General Catalyst Brad FeldCo-founder of Foundry and Techstars Chris MorrisProcess Specialist, Exit Readiness at Mayfair Equity Partners BirgitteInvestor at Investinor OlaInvestor at Investinor

+ 825 more

Also attended UC Santa Barbara437

Logan GreenCo-founder of Lyft Jen WangDeal Operations Manager at Felicis Ventures Arturo LitvinHead of Global Portfolio Development at Intel Capital Kevin ThauInvestor at Spark Capital Erica DelamareInvestor at Daphni Danielle RomanowskiExecutive Assistant at Sapphire Ventures

+ 431 more

Shared employers

Also worked at Rune Labs4

Ishan PherwaniAssociate at Scale Venture Partners Ammar HanafiGeneral Partner at Moment Ventures, Llc David KimManaging Director at DigiTx Partners LLC Brian PepinExecutive Officer, Director at Rune Labs

Also worked at SafelyYou7

Joanne ChenInvestor at Foundation Capital Evan WijayaPrincipal at Touring Capital Kelly ChenPartner at NATO Innovation Fund Chris FurmanskiManaging Director at Pacific Health Ventures Geordie GrahamFounder at Ruta Health Derek R. ZhangFounder at Ruta Health

+ 1 more

Also worked at Cellares3

Ezekiel EmanuelVenture Partner at Oak HC/FT Fabian GerlinghausCo-Founder and Chief Executive Officer at Cellares Omar KurdiCo-Founder and President at Cellares

Also worked at Spell1

Serkan PiantinoVenture Partner at Floating Point