Fundraising Fox

Alexandra Cantley

Investor

Managing Partner at Polaris Partners

New York, New York

Writes $300K – $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

  1. Polaris PartnersPartnercurrent2021 β€” present
  2. Polaris PartnersPrincipalcurrent2019 β€” present
  3. Amplifire eLearningBoard Membercurrent2026 β€” present
  4. Cirrus TherapeuticsBoard Membercurrent2025 β€” present
  5. Crossbow Therapeutics, IncBoard Membercurrent2023 β€” present
  6. Auron Therapeutics, Inc.Board Membercurrent2022 β€” present
  7. TRexBioBoard Membercurrent2022 β€” present
  8. EpiBiologicsBoard Membercurrent2022 β€” present
  9. Capstan TherapeuticsBoard Observer2022 β€” 2025
  10. Inzen TherapeuticsScientist2017 β€” 2019New York City Metropolitan Area
  11. Vertex PharmaceuticalsVertex Fellow2016 β€” 2017
  12. Harvard UniversityGraduate Student2011 β€” 2016Harvard Medical School
  13. Columbia UniversityResearch technician2009 β€” 2011

Education

  1. Harvard UniversityDoctor of Philosophy (PhD), Chemical Biology2011 β€” 2016
  2. New York UniversityBachelor of Arts (B.A.)2005 β€” 2009

Skills & more

High Throughput Screening11Organic synthesis3NMR8Mass Spectrometry8chemical biology4HPLC6Environmental microbiology3Analytical Chemistry4Chemical Biology4Organic Synthesis6Western Blotting2

From Alexandra's professional profile.

Same school

Shared employers

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.