Cary Pfeffer, Third Rock Ventures

Cary Pfeffer, a Partner at Third Rock Ventures, invests in early-to-mid-stage life sciences and biotechnology companies. See sector focus and contact routes.

About Cary Pfeffer

Cary Pfeffer, a Partner at Third Rock Ventures, invests in early-to-mid-stage life sciences and biotechnology companies, focusing on novel drug discovery, gene and cell therapies, immunology, oncology, and neuroscience. His recorded investments include Series A and B rounds typically ranging from $12M to $81M, with a personal sweet spot around $1.5M and an investment range of $100K–$5.0M. Notable portfolio companies he has helped launch or lead include Jounce Therapeutics (cancer immunotherapy), Neon Therapeutics (immuno-oncology), Rheos Medicines (immunometabolism), and TARIS Biomedical, where he joined the board. Pfeffer’s distinctive thesis aligns with Third Rock’s “Discover-Launch-Build-Transform” model, which actively shapes company strategy from inception rather than investing in pre-formed entities.

Cary Pfeffer at a glance

Role
Partner
Organization
Third Rock Ventures
Location
Boston, Massachusetts, United States
Investor type
Venture Capital
Focus areas
Biotech

Frequently asked about Cary Pfeffer

What does Cary Pfeffer invest in?
Cary Pfeffer at Third Rock Ventures (Boston, Massachusetts, United States) — sector focus: Biotech.
How do I contact Cary Pfeffer?
Cary Pfeffer's published profile links (website, LinkedIn or X where available) are listed on the StartupFundraising.com investor profile.
Where is Cary Pfeffer based?
Cary Pfeffer is based in Boston, Massachusetts, United States.

Every field above is read from the StartupFundraising investor directory — disclosed location, recorded investments and stated focus — and re-checked as filings arrive. Founders pair it with investors in Boston when building a target list.

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