Lewis Wanjohi
InvestorFounderFellow at Halcyon · Founder at Tambua Health
United States
FoundedTambua Health · YC
Find your path to Lewis
3,209 people in our graph share verified history with Lewis — schools, employers, funds. One of them is your warm intro.
Arhaan A.unlockedLewis: together at Y Combinator (2022)
Lewis: together at Massachusetts Institute of Technology
×9Lewis: together at Y Combinator
Lewis: together at MIT Media Lab
About
Lewis Wanjohi studied mathematics and computer science at MIT and is based in San Francisco, currently working on applied category theory and homotopy type theory at Tambua Health.
Founder at Tambua HealthYC W20
Intro paths
YC
Lewis went through Y Combinator (Winter 2020) — any YC alum in your network can reach them through the YC community.
→
In turn, Lewis can intro founders to Tambua Health's investors below.
Tambua Health's investors · 2
Experience
- Yoneda TherapeuticsChief Executive Officercurrent2026 — presentSan Francisco Bay Area
- Yoneda Metals & ChemicalsChief Executive Officercurrent2026 — present
- Homotopic IntelligenceCo-Founder & CEOcurrent2025 — presentSan Francisco Bay Area
- AppleCompiler & Emulator Engineercurrent2024 — presentBeijing, China
- Y CombinatorTambua Healthcurrent2019 — presentMountain View, California
- Tambua HealthCo-Founder & CEOcurrent2018 — presentSan Francisco Bay Area
- Echoing GreenFellowcurrent2019 — presentNew York City Metropolitan Area
- HalcyonFellowcurrent2022 — presentWashington DC-Baltimore Area
- We Are Family FoundationWe Are Family Foundation Global Leadercurrent2018 — presentNew York, United States
- MIT Media LabSpectral Analysis Research2017 — 2018
- FIRSTSoftware Developer2017Washington DC-Baltimore Area
Colleagues at Halcyon
Abasi Awazi
Investor at Halcyon
Abdulrhman
Investor at Halcyon
Abhisri Ramesh
Investor at Halcyon
Ada Pinkston
Investor at Halcyon
Adam Caplan
Manager, Capital Strategy & Investment at Halcyon
Adebayo Dawodu
Investor at Halcyon
Adekoyejo Kuye
Investor at Halcyon
Alexis Kartalian
Senior Coordinator, Portfolio & Community at Halcyon
Frequently asked questions
- Who is Lewis Wanjohi?
- Lewis Wanjohi studied mathematics and computer science at MIT and is based in San Francisco, currently working on applied category theory and homotopy type theory at Tambua Health.
- Where does Lewis Wanjohi work?
- Lewis Wanjohi is Founder of Tambua Health and Fellow at Halcyon.
- What companies did Lewis Wanjohi found?
- Lewis Wanjohi founded Tambua Health.
- Where did Lewis Wanjohi go to school?
- Lewis Wanjohi studied at Massachusetts Institute of Technology (Programming with Category Theory); Massachusetts Institute of Technology (Bachelor's degree, Mathematics and Computer Science).
Founder mafias
Y Combinator mafia10,230
Also came through, then founded or led a company.
Sam AltmanPresidentFounded Tools for Humanity +3Garry TanPresident & CEOFounded Y Combinator +1Jessica LivingstonCo-founderFounded Y CombinatorAlexis OhanianPartnerFounded RedditFred EhrsamYC Summer 2012Founded Nudge +1Matt HuangYC Winter 2011Founded Paradigm +1
+ 10,223 more
Massachusetts Institute of Technology mafia1,221
Also came through, then founded or led a company.
Elad GilPhDFounded Brain Co. +1Hemant TanejaMinorFounded Hippocratic AINat FriedmanBachelor of ScienceFounded XamarinBrad FeldS.B.Founded TechstarsMatt HuangB.S.Founded Paradigm +1Delian AsparouhovDropoutFounded Nightingale +1
+ 1,214 more
Apple mafia306
Also came through, then founded or led a company.
Steve JurvetsonProduct MarketingFounded Future Ventures +1Kai-Fu LeeVice president (last job)Founded 01Brian ActonHardware Test EngineerFounded WHATS APP +1IanUser Experience and EngineeringFounded Apex Technology +3Jon LernerSoftware Engineer (Intern)Founded Textnow +2Brian BrackeenSr. Project ManagerFounded Lightship +1
+ 299 more
Halcyon mafia9
Also came through, then founded or led a company.
Sam Owen2026-7 Alumni Steering Committee MemberFounded Otolith Medical Devices & Equipment +1Chrissa McFarlaneUS Health FellowFounded PatientoryAmrita BhasinClimate FellowFounded SotiraDavid HojahSocial impact fellowFounded ParrotsDonat2026 Global Climate FounderFounded scout labsNikita GuptaHalcyon FellowFounded Symba
+ 2 more
Same school
Also attended Massachusetts Institute of Technology2,000
Hemant TanejaCEO & Managing Director of General CatalystNat FriedmanCo-lead of Meta Superintelligence Labs; co-founder of NFDGBrad FeldCo-founder of Foundry and TechstarsMatt HuangCo-founder and Managing Partner at ParadigmDelian AsparouhovPartner at Founders Fund and co-founder of VardaDrew HoustonCo-founder & CEO of Dropbox
+ 1,994 more
Shared employers
Also worked at Apple787
Jim BreyerFounder & CEO of Breyer CapitalDaniel GrossMeta Superintelligence Labs; co-founder of NFDG and Safe SuperintelligenceSteve JurvetsonCo-founder of Future VenturesKai-Fu LeeChairman of Sinovation Ventures and CEO of 01.AISteve WozniakCo-founder of AppleBrian ActonCo-founder of WhatsApp; co-founder of Signal Foundation
+ 781 more
