Fundraising Fox
Beth Seidenberg
InvestorGeneral Partner at Westlake BioPartners · Managing Director at Westlake Village BioPartners
Westlake Village, California, United States
Writes $100K – $5M checks
Midas 2020 · #54Midas 2019 · #59Midas 2018 · #62Midas 2016 · #98Midas 2015 · #91
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About
Beth Seidenberg is a board‑certified physician and immunologist with rare drug‑development experience—helping develop Singulair at NIH and large pharma—who holds senior roles and chairs therapeutic boards shaping LA biotech ecosystem.
Contact· published on Beth's own website
Invests in
AI & Machine LearningBiotechHealthtechMedical Devices
Beyond investing
- Education
- Studied at Barnard College (Bachelor of Arts, biology and anthropology) Studied at University of Miami School of Medicine
From Beth's own website — common ground for a warm intro.
Deals · 15
Star TherapeuticsBoard seat
via Westlake Village BioPartners · filed Oct 2025 · $125M raise
Latigo BioBoard seat
via Westlake Village BioPartners · filed Feb 2025 · $150M raise
Arsenal BiosciencesBoard seat
via Westlake Village BioPartners · filed Sep 2024 · $325.4M raise
Arsenal BiosciencesBoard seat
via Kleiner Perkins · filed Sep 2022 · $33M raise
Sagimet BiosciencesBoard seat
via Westlake Village BioPartners · filed Jan 2021 · $80M raise
Tmunity TherapeuticsBoard seat
via Kleiner Perkins · filed Oct 2019 · $75M raise
FLX BioBoard seat
via Kleiner Perkins · filed Jun 2019 · $67.1M raise
KinsaBoard seat
via Kleiner Perkins · filed Apr 2018 · $14M raise
Breathe TechnologiesBoard seat
via Kleiner Perkins · filed Sep 2017 · $8.5M raise
Hixme Insurance SolutionsBoard seat
via Kleiner Perkins · filed Oct 2016 · $16M raise
Cell Design LabsBoard seat
via Kleiner Perkins · filed Jun 2016 · $22.9M raise
TesaroBoard seat
via Kleiner Perkins · filed Mar 2016 · $155M raise
LivongoBoard seat
via Kleiner Perkins · filed Apr 2015 · $20M raise
Flexus BiosciencesBoard seat
via Kleiner Perkins · filed Mar 2015 · $15.2M raise
AuxogynBoard seat
via Kleiner Perkins · filed Mar 2015 · $41M raise
Attribution from SEC filings, press coverage, and firm rosters.
Other disclosed investments
Board seats
Investor
AcelyrinARMO BioSciencesArsenalBioAtara BiotherapeuticsCapsida BiotherapeuticsElectra TherapeuticsEpizymeExpansion TherapeuticsHixmeiPierianKate TherapeuticsKyverna TherapeuticsMango HealthNeuron23Oorja BioPractice FusionProgynyRedbrick HealthVera Therapeutics
Sources: SEC Form D filings · curated public sources.
Colleagues at Westlake BioPartners
Network11
Investors connected to Beth in public investor directories — a warm-intro map.
Frequently asked questions
- Who is Beth Seidenberg?
- Beth Seidenberg is a board‑certified physician and immunologist with rare drug‑development experience—helping develop Singulair at NIH and large pharma—who holds senior roles and chairs therapeutic boards shaping LA biotech ecosystem.
- Where does Beth Seidenberg work?
- Beth Seidenberg is General Partner at Westlake BioPartners and Managing Director at Westlake Village BioPartners.
- What does Beth Seidenberg invest in?
- Beth Seidenberg invests in AI & Machine Learning, Biotech, Healthtech, Medical Devices.
- What check size does Beth Seidenberg write?
- Beth Seidenberg typically writes checks of $100K – $5M.
- What boards does Beth Seidenberg sit on?
- Beth Seidenberg holds tracked board seats at Arsenal Biosciences, Auxogyn, Breathe Technologies, Breathe Technologies, Cell Design Labs, Flexus Biosciences, FLX Bio, FLX Bio, Hixme Insurance Solutions, Kinsa.
- What companies has Beth Seidenberg invested in?
- Investments tracked here include Acelyrin, ARMO BioSciences, ArsenalBio, Atara Biotherapeutics, Breathe Technologies, Capsida Biotherapeutics, Electra Therapeutics, Epizyme, Expansion Therapeutics, Flexus Biosciences, Hixme, iPierian, and 13 more.
About this profile. Compiled from public sources — Westlake BioPartners's own website, regulatory filings and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights