Cary Pfeffer, M.D.

Partner

Cary Pfeffer joined Third Rock Ventures at its inception in 2007 and has more than 20 years of business development and transaction experience, along with a broad array of biotech product development experience. Cary leads our partner development efforts, including building and maintaining strong relationships to work with large biotech and pharmaceutical companies. He has played an instrumental role in a number of innovative alliances and collaborative company building efforts across our portfolio, including an industry-leading global strategic collaboration between Agios and Celgene in the field of cancer metabolism. Cary supports and advises on business development efforts across our portfolio and has also assumed active leadership roles in our portfolio companies, functioning as chief executive officer and chief business officer through the first 12-18 months after launch:

  • Board member and interim chief business officer of Casma Therapeutics
  • Board member and former interim chief business officer of Rheos Medicines
  • Board member and former interim chief business officer of Tango Therapeutics
  • Board member of Ablexis
  • Former board member of Edimer
  • Chairman of the board and former interim chief executive officer of Neon Therapeutics 
  • Former chairman of the board of directors and former interim chief executive officer of Jounce Therapeutics
  • Former board member and interim chief business officer of Sesen Bio
  • Former board member of Taris Biomedical

Before joining Third Rock, Cary founded The Pfeffer Group, a boutique consulting firm that provided business development and strategy advisory services, completing multiple transactions for leading biotechnology and life sciences companies. Prior to that, Cary spent more than a decade at Biogen where he held a variety of senior and executive level U.S. and global management roles focused on business and market development, product development and commercial operations. Earlier in his career, Cary spent several years in corporate finance in the Health Care Investment Banking Group of Lehman Brothers. He earned his M.D. from the University of Pennsylvania, his MBA from the Wharton School of the University of Pennsylvania and holds a B.A. in biochemistry from Columbia University.

Cary learned to play ping pong from his dad at age 8 and played and won multiple competitive camp tournaments in his teens.

Administrative Support

Zoë Angell
Executive Assistant
Zoe@thirdrockventures.com

Associated Portfolio Companies

Partners

Alexis Borisy

Partner

Abbie Celniker, Ph.D.

Partner

Neil Exter

Partner

Kevin Gillis

Partner/Chief Financial Officer

Charles Homcy, M.D.

Partner

Sarah Larson

Partner/Chief Human Resources Officer

Mark Levin

Partner

Craig Muir

Partner/Chief Technology Officer

Cary Pfeffer, M.D.

Partner

Kevin Starr

Partner

Robert Tepper, M.D.

Partner

Venture Partners

Jeffrey Finer, M.D., Ph.D.

Venture Partner

Frank T. Gentile, Ph.D.

Venture Partner

Steve Kafka, Ph.D.

Venture Partner

Robert Kamen, Ph.D.

Venture Partner

Christoph Lengauer, Ph.D.

Venture Partner

Philip Reilly, M.D., J.D.

Venture Partner

Ton Schumacher, Ph.D.

Venture Partner

Stephen Sherwin, M.D.

Venture Partner

Jeffrey Tong, Ph.D.

Venture Partner

Barbara Weber, M.D.

Venture Partner

Entrepreneurs-In-Residence

Jason Coloma, Ph.D.

Entrepreneur-in-Residence

Peter DiLaura

Entrepreneur-in-Residence

Eric Green, M.D., Ph.D.

Entrepreneur-in-Residence

Rachel Meyers, Ph.D.

Entrepreneur-in-Residence

Glenn Pierce, M.D., Ph.D.

Entrepreneur-in-Residence

Richard Ransohoff, M.D.

Entrepreneur-in-Residence

Markus Warmuth, M.D.

Entrepreneur-in-Residence

Domain Experts

Karina Chmielewski

Senior Director, Platform Operations

Dina Ciarimboli

General Counsel

Cynthia Clayton

Head of Communications & Investor Relations

Aremin Hacobian

Head, Organization Health and Development

John Keilty

Strategic Advisor, Platform Operations

Corey O’Keeffe

Manager, Communications & Investor Relations

Raynie Smith

Director, Human Resources

Principals and Associates

Walter Kowtoniuk, Ph.D.

Principal

Rahul Mahajan, M.D., Ph.D.

Fellow

Claire Mazumdar, Ph.D., M.B.A.

Senior Associate

Melissa McCracken, Ph.D.

Associate

Kelly Moynihan, Ph.D.

Associate

Luke R. G. Pike, M.D., Ph.D.

Senior Associate

Vyas Ramanan, Ph.D.

Senior Associate

Vanessa Van Voorhis, Ph.D.

Senior Associate

Andrew Warren, Ph.D.

Associate

Timur Yusufzai, Ph.D.

Senior Associate

Recruiting

Andrea DiMella

Recruiting Director

Wendy Durkin

Senior Director, Recruiting and University Relations

Tracy Nicholson

Recruiting Director

Chris Robinson

Vice President, Recruiting

Administrative

Zoe Angell

Executive Assistant

Rhea Bisgounis

Receptionist/Administrative Assistant

Tracilyn Garcia-Lum

Executive Assistant

Linda Heath

Executive Assistant

Maribel Laboy

Executive Assistant

Megan Lamb

Executive Assistant

Ian Miller

Administrative Assistant

Angelo Severino

Executive Assistant

Laura Vitale

Executive Assistant

Tracy Williams

Executive Assistant

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Check our Careers page to learn about career opportunities within the Third Rock portfolio

Third Rock Careers