Jason P. Hafler
InvestorManaging Director at Sanofi Ventures
Cambridge, Massachusetts
Writes $5M – $10M checks · typically $7.5M
About
Jason P. Hafler combines venture investing and biotech operating experience—ex-Translate Bio corporate development director and Atlas investor—and leads strategy and is public voice for a corporate VC's early-stage biotech focus.
Invests in
AI & Machine LearningBiotechData & InfrastructureHealthtechMedical Devices
Experience
- Sanofi VenturesManaging Directorcurrent2019 — present
- Sanofi VenturesHead Sanofi Ventures Investments2017 — 2019
- Sanofi VenturesSenior Director of Investments2015 — 2017Greater Boston
- Sanofi VenturesDirector of Investments2014 — 2015
- Buckingham, Browne & NicholsBoard of Trusteescurrent2011 — present
- Madgalene College FoundationMember Board of Directorscurrent2011 — present
- Beacon Hill Nursery SchoolMember Board of Trustees2018 — 2021
- RaNA TherapeuticsCorporate Development2012 — 2014
- Bowdoin CollegeFund Directors Board2010 — 2013
- Atlas VentureAssociate2010 — 2012
- Flagship VenturesFlagship Summer Fellow2010
- JSB-Partners, LPAnalyst2004 — 2006
Education
- University of CambridgePhD
- Bowdoin College
- BB&N
Skills & more
+8 more
Emerging MarketsInvestmentsStart-upsCorporate FinanceHedge FundsAlternative InvestmentsInvestor RelationsDue DiligenceFrom Jason's professional profile.
Same school
Also attended University of Cambridge621
+ 615 more
Also attended Bowdoin College46
+ 40 more
Shared employers
Also worked at Bowdoin College6
Also worked at Atlas Venture51
+ 45 more
Also worked at Flagship Ventures66
+ 60 more
Deals · 5
Star Therapeutics LLCBoard seat
via Sanofi Ventures · filed Oct 2025 · $125M raise
Matchpoint Therapeutics Inc.Board seat
via Sanofi Ventures · filed Oct 2022 · $70M raise
AbcuroBoard seat
via Sanofi Ventures · filed Jan 2021 · $42M raise
Escient PharmaceuticalsBoard seat
via Sanofi Ventures · filed Sep 2020 · $77.5M raise
Expansion TherapeuticsBoard seat
via Sanofi Ventures · filed Jun 2017 · $5M raise
Attribution from SEC filings, press coverage, and firm rosters.
Colleagues at Sanofi Ventures
Network4
Investors connected to Jason in public investor directories — a warm-intro map.

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