Alexandra Cantley
InvestorManaging Partner at Polaris Partners
New York, New York
Writes $300K β $2M checks Β· typically $500K
FoundedCirrus Therapeutics, Inc.Crossbow TherapeuticsTRex Holdings Inc.
About
Alexandra Cantley is a managing partner at Polaris Partners, which she joined in 2019, working from the New York office with a focus on early-stage biotech and healthcare investments. Before Polaris, she was part of the initial research team at Inzen Therapeutics and previously held a research fellowship at Vertex Pharmaceuticals. She holds a PhD in Chemical Biology from Harvard University and completed her undergraduate studies at New York University.
Invests in
BiotechHealthtech
Experience
- Polaris PartnersPartnercurrent2021 β present
- Polaris PartnersPrincipalcurrent2019 β present
- Amplifire eLearningBoard Membercurrent2026 β present
- Cirrus TherapeuticsBoard Membercurrent2025 β present
- Crossbow Therapeutics, IncBoard Membercurrent2023 β present
- Auron Therapeutics, Inc.Board Membercurrent2022 β present
- TRexBioBoard Membercurrent2022 β present
- EpiBiologicsBoard Membercurrent2022 β present
- Capstan TherapeuticsBoard Observer2022 β 2025
- Inzen TherapeuticsScientist2017 β 2019New York City Metropolitan Area
- Vertex PharmaceuticalsVertex Fellow2016 β 2017
- Harvard UniversityGraduate Student2011 β 2016Harvard Medical School
- Columbia UniversityResearch technician2009 β 2011
Education
- Harvard UniversityDoctor of Philosophy (PhD), Chemical Biology2011 β 2016
- New York UniversityBachelor of Arts (B.A.)2005 β 2009
Skills & more
From Alexandra's professional profile.
Same school
Also attended New York University298
+ 292 more
Shared employers
Also worked at Amplifire eLearning1
Also worked at TRexBio6
Also worked at Capstan Therapeutics3
Also worked at Vertex Pharmaceuticals20
+ 14 more
Deals Β· 8
Auron TherapeuticsBoard seat
via Polaris Partners Β· filed Dec 2025 Β· $42.3M raise
Crossbow TherapeuticsBoard seat
via Polaris Partners Β· filed Sep 2025 Β· $80M raise
Cirrus Therapeutics, Inc.Board seat
via Polaris Partners Β· filed Aug 2025 Β· $15.7M raise
TRex Holdings Inc.Board seat
via Polaris Partners Β· filed Nov 2024 Β· $85M raise
Epi BiologicsBoard seat
via Polaris Partners Β· filed Apr 2024 Β· $73M raise
SunBird Bio, Inc.Board seat
via Polaris Partners Β· filed May 2023 Β· $23.2M raise
Be Me HealthBoard seat
via Polaris Partners Β· filed Nov 2022 Β· $8.2M raise
PodimetricsBoard seat
via Polaris Partners Β· filed Apr 2022 Β· $60M raise
Attribution from SEC filings, press coverage, and firm rosters.
Colleagues at Polaris Partners
Network10
Investors connected to Alexandra in public investor directories β a warm-intro map.































