About
Josh Grehan led a microbiome company through FDA approval and an IPO, now focuses on the battery/energy‑storage stack (critical minerals to recycling), spending ~25% supporting founders as a long‑term partner.
Contact· self-published, not guessed
Invests in
Climate TechDeep TechEnergyHardwareMobility & TransportationNew Materials
Experience
- Helios Climate VenturesPartnercurrent2025 — present
- Helios Climate VenturesPrincipal2022 — 2024
- Helios Climate VenturesEntrepreneur in Residence2021
- Aqua Membranes, Inc.Board Observercurrent2025 — present
- GDIBoard Membercurrent2023 — present
- Ambient PhotonicsBoard Member2024 — 2025
- Maxterial, Inc.Board Member2024
- AMPBoard Observer2022 — 2023
- Finch Therapeutics GroupAssociate Director2020 — 2022Somerville, Massachusetts, United States
- Finch Therapeutics GroupSenior Manager2017 — 2020Somerville, Massachusetts, United States
- Action CanadaFellow2019 — 2020
- Government of CanadaSpecial Assistant to the Minister of Foreign Affairs2016 — 2017Greater Ottawa Metropolitan Area
- Government of CanadaParliamentary Internship Programme Fellow2015 — 2016Greater Ottawa Metropolitan Area
- OpenBiomeDirector2015Greater Boston
- The Bridgespan GroupAssociate Consultant2013 — 2015Boston, Massachusetts, United States
- KickStart InternationalDevelopment Associate2012 — 2013
Skills & more
Public Speaking8NegotiationCapacity BuildingStrategic Planning1Team ManagementResearch20Policy Analysis16Data Analysis9StatisticsInternational Relations11SPSS1Editing2
+12 more
EconomicsPublic PolicyFrenchMicrosoft OfficeGrant WritingEnglishTeachingPolitical ScienceNonprofitsQualitative ResearchInternational DevelopmentFundraisingLanguages English · French
From Josh's professional profile.
Colleagues at Helios Climate Ventures
Daniel Doimo
Partner at Helios Climate Ventures
Inbal Shenfeld Kolodziejska
Investor at Helios Climate Ventures
Jamie Weigt
Chief Administrator at Helios Climate Ventures
Jesse Johnson
Managing Director at Helios Climate Ventures
Sam Kogan
Managing Director at Helios Climate Ventures
Terry Kellogg
Managing Director at Helios Climate Ventures
Frequently asked questions
- Who is Josh Grehan?
- Josh Grehan led a microbiome company through FDA approval and an IPO, now focuses on the battery/energy‑storage stack (critical minerals to recycling), spending ~25% supporting founders as a long‑term partner.
- Where does Josh Grehan work?
- Josh Grehan is Partner at Helios Climate Ventures.
- What does Josh Grehan invest in?
- Josh Grehan invests in Climate Tech, Deep Tech, Energy, Hardware, Mobility & Transportation, New Materials.
- Where did Josh Grehan go to school?
- Josh Grehan studied at University of Oxford (Master of Philosophy (MPhil), Economic and Social History); Princeton University (AB, Public Policy); Lester B. Pearson United World College (UWC).
Same school
Also attended University of Oxford990
Reid HoffmanCo-founder of LinkedIn; Partner at GreylockMichael MoritzFormer Partner at Sequoia Capital; Senior Adviser at Sequoia HeritageBrad GerstnerFounder & CEO of Altimeter CapitalGabriel PereyraCo-founder & President of HarveyDominic JacquessonInvestor at Index VenturesErin Price-WrightInvestor at Index Ventures
+ 984 more
Also attended Princeton University582
Fabrice GrindaCo-founder & Managing Partner at FJ LabsRyan SheaCo-founder of Blockstack (Stacks)Dario AmodeiCo-founder & CEO of AnthropicFei-Fei LiCo-founder & CEO of World Labs; Sequoia Professor of Computer Science at StanfordAndrewAdvisor at Clear VenturesChristal NgAssociate at Golden Gate Ventures
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Shared employers
Also worked at Aqua Membranes, Inc.2
Also worked at Finch Therapeutics Group1
Also worked at Action Canada2
Also worked at Government of Canada14
Sanjay ZimmermannGeneral Partner at White Star CapitalDominic BartonPartner at Radical VenturesJoshuah LebacqPrincipal at NAventuresTem TumurbatCo-Founder and Managing Partner at Nomadic Venture PartnersMobeen LalaniManager, Technology and Venture Development and Co-Director, UTEST at Toronto Innovation Acceleration PartnersEmelia NyarkuFabrication Lab (FabLab) Project Manager at North Forge Angel Network
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