Where does Beth Seidenberg work?

Beth Seidenberg is Managing Director at Westlake Village BioPartners and Board director at Arsenal Biosciences and Board director at Breathe Technologies and Board director at Veratx.

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.

Where did Beth Seidenberg go to school?

Beth Seidenberg studied at Barnard College (Bachelor of Science (BS)); University of Miami Miller School of Medicine (Doctor of Medicine (MD)); The Johns Hopkins University School of Medicine (Post Graduate Training).

Beth Seidenberg

Investor

Managing Director at Westlake Village BioPartners · Board director at Arsenal Biosciences · Board director at Breathe Technologies · Board director at Veratx

Westlake Village, California, United States

Writes $100K – $5M checks

Midas 2020 · #54 Midas 2019 · #59 Midas 2018 · #62 Midas 2016 · #98 Midas 2015 · #91

Find your path to Beth

554 people in our graph share verified history with Beth — schools, employers, funds. One of them is your warm intro.

Alex TranunlockedBeth: together at Kleiner Perkins (2012–2017)

×5Beth: together at Kleiner Perkins

×3Beth: together at Livongo

×2Beth: together at Barnard College

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

b•••@westlakebio.comreveal

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.

Board director at Arsenal Biosciences

Intro paths

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In turn, Beth can intro founders to Arsenal Biosciences's investors below.

Arsenal Biosciences's investors · 6

ARCH Venture PartnersChicago · $50K – $250M checks Hitachi VenturesMunich Kleiner PerkinsMenlo Park · $500K – $15M checks · since 2020 OUP (Osage University Partners)Bala Cynwyd · $1M – $20M checks SoftBank Vision FundLondon Westlake Village BioPartnersLos Angeles · $100K – $5M checks · since 2024

Co-founders at Arsenal Biosciences

Ken DrazanFounder

Board director at Breathe Technologies

Intro paths

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In turn, Beth can intro founders to Breathe Technologies's investors below.

Breathe Technologies's investors · 2

Dag VenturesPalo Alto Kleiner PerkinsMenlo Park · $500K – $15M checks · since 2017

Board director at Veratx

Intro paths

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In turn, Beth can intro founders to Veratx's investors below.

Veratx's investors · 5

AbingworthLondon · $15M – $30M checks · since 2020 Kleiner PerkinsMenlo Park · $500K – $15M checks · since 2020 Longitude CapitalMenlo Park · $10M – $30M checks · since 2020 Sofinnova Venture PartnersMenlo Park · since 2020 Sofinnova VenturesMenlo Park · $100K – $15M checks · since 2021

Co-founders at Veratx

Marshall FordyceExecutive Officer, Director

Experience

Westlake Village BioPartnersCo-founding Managing Director at Westlake Village BioPartnerscurrent2018 — presentWestlake Village, California
Kleiner PerkinsGeneral Partnercurrent2005 — presentMenlo Park, CA
AmgenSenior Vice President2002 — 2005Thousand Oaks
Bristol Myers SquibbSenior Vice President, Global Development2001 — 2002
Bristol Myers SquibbSenior Vice President, Clinical Development & Life Cycle Management2000 — 2001
Bristol Myers SquibbVice President, Clinical Immunology/Pulmonary/Dermatology2000
MerckVice President, Pulmonary-Immunology1998 — 2000
MerckExecutive Director1996 — 1998
MerckSenior Director1993 — 1996
MerckDirector, Clinical Pharmacology1991 — 1993
MerckAssociate Director, Clinical Pharmacology1989 — 1991

Skills & more

Start-ups18Business Strategy20Life Sciences9Entrepreneurship7Business Development6Venture Capital8Strategy10Leadership8Strategic Planning17Management10

From Beth's professional profile.

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

Veratx

Investor

AcelyrinARMO BioSciencesArsenalBioAtara BiotherapeuticsCapsida BiotherapeuticsElectra TherapeuticsEpizymeExpansion TherapeuticsHixmeiPierianKate Therapeutics Kyverna Therapeutics Mango Health Neuron23 Oorja Bio Practice Fusion ProgynyRedbrick HealthVera Therapeutics

Sources: SEC Form D filings · curated public sources.

Colleagues at Westlake Village BioPartners

Anurag Agarwal

CEO & co-founder at Westlake Village BioPartners

Armando Alvarez

Finance Manager at Westlake Village BioPartners

Brogan Perrelli

VP of Finance and Operations at Westlake Village BioPartners

David Allison

Managing Director at Westlake Village BioPartners

Desmond Padhi

Operating Partner at Westlake Village BioPartners

Eric Kaufman

Vice President at Westlake Village BioPartners

Jennifer Kercher

General Counsel at Westlake Village BioPartners

Kelli McKeirnan

Director of Administration at Westlake Village BioPartners

Network9

Mamoon HamidScout

Partner at Kleiner Perkins

Brook ByersScout

Founder, Kleiner Perkins

Ilya FushmanScout

Partner at KPCB

Leigh Marie BraswellScout

Partner at KPCB

John Doerr

Chairman of Kleiner Perkins

Annie Case

Advisor at KPCB

Bing Gordon

Advisor and Chief Product Officer at Kleiner Perkins

Carl Gordon

Managing Partner at OrbiMed

Josh Coyne

Partner at KPCB

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 Managing Director at Westlake Village BioPartners and Board director at Arsenal Biosciences and Board director at Breathe Technologies and Board director at Veratx.
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.
Where did Beth Seidenberg go to school?: Beth Seidenberg studied at Barnard College (Bachelor of Science (BS)); University of Miami Miller School of Medicine (Doctor of Medicine (MD)); The Johns Hopkins University School of Medicine (Post Graduate Training).