Fundraising Fox

Christoph Westphal

Investor

Co-Founder & General Partner at Longwood Fund · Board director at Newleos Therapeutics · Board director at Immunitas Therapeutics · Board director at TScan Therapeutics

About

Christoph Westphal is a company creator turned venture capitalist who co-founded numerous biotech firms—Alnylam, Momenta, Acceleron, Sirtris—and serves on the Boston Symphony Orchestra board and Celtics ownership group.

Contact· self-published, not guessed

Invests in

AI & Machine LearningBiotechHealthtechMedical Devices

Board director at Newleos Therapeutics

Intro paths

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In turn, Christoph can intro founders to Newleos Therapeutics's investors below.

Newleos Therapeutics's investors · 4

DCVC (Data Collective)Palo Alto · $5M – $25M checks · since 2025DCVC BioPalo Alto · since 2025Longwood FundBoston · since 2025Novo HoldingsCopenhagen · $1.1M – $54M checks · since 2025

Board director at Immunitas Therapeutics

Intro paths

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In turn, Christoph can intro founders to Immunitas Therapeutics's investors below.

Immunitas Therapeutics's investors · 9

Agent CapitalWaltham · since 2021DC Investment PartnersMcLean · $10M checks · since 2021Leaps by BayerLeverkusen · since 2021Longwood FundBoston · since 2021M VenturesLos Angeles · $10.8M checks · since 2021Medical Excellence CapitalNew York · since 2021Novartis Venture FundBasel · $5M – $25M checks · since 2021Ono Venture Investment, Inc.South San Francisco · since 2021Solasta VenturesBoston · since 2021

Board director at TScan Therapeutics

Intro paths

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In turn, Christoph can intro founders to TScan Therapeutics's investors below.

TScan Therapeutics's investors · 7

6 Dimensions CapitalGrand Cayman · since 2019Astellas Venture Management LLCSouth San Francisco · $200K – $5M checksBessemer Venture PartnersRedwood City · $5M – $100M checksLongwood FundBoston · since 2019Longwood Special SituationsBoston · since 2021PitangoTel Aviv · $4M – $100M checks · since 2021RA CapitalBoston

Deals · 3

Newleos TherapeuticsBoard seat

via Longwood Fund · filed Feb 2025 · $93.4M raise

Immunitas TherapeuticsBoard seat

via Longwood Fund · filed Aug 2021 · $57.7M raise

Pyxis OncologyBoard seat

via Longwood Fund · filed Jul 2019 · $22M raise

Attribution from SEC filings, press coverage, and firm rosters.

Other disclosed investments

Per SEC Form D filings.

Colleagues at Longwood Fund

Al Sandrock
Strategic Advisory Board at Longwood Fund
Aleks Radovic-Moreno
Partner at Longwood Fund
Alex Margolin
Venture Partner at Longwood Fund
Annalisa D'Andrea
Venture Partner at Longwood Fund
Annalisa D’Andrea
Venture Partner at Longwood Fund
Anne Klibanski
Strategic Advisory Board at Longwood Fund
Annie Vemu
Senior Associate at Longwood Fund
Aparaajita Balaji
Associate at Longwood Fund

Frequently asked questions

Who is Christoph Westphal?
Christoph Westphal is a company creator turned venture capitalist who co-founded numerous biotech firms—Alnylam, Momenta, Acceleron, Sirtris—and serves on the Boston Symphony Orchestra board and Celtics ownership group.
Where does Christoph Westphal work?
Christoph Westphal is Co-Founder & General Partner at Longwood Fund and Board director at Newleos Therapeutics and Board director at Immunitas Therapeutics and Board director at TScan Therapeutics.
What does Christoph Westphal invest in?
Christoph Westphal invests in AI & Machine Learning, Biotech, Healthtech, Medical Devices.
What boards does Christoph Westphal sit on?
Christoph Westphal holds tracked board seats at Immunitas Therapeutics, Newleos Therapeutics, Pyxis Oncology, TScan Therapeutics, Werewolf Therapeutics.