Walter Kowtoniuk, Ph.D.

Principal

Walt is a company creator with nearly a decade of experience working at the intersection of strategy and science. At Third Rock, Walt focuses on discovering, launching, and building companies aimed at treating rare genetic diseases and transforming the lives of patients. He first joined Third Rock in 2013 as a senior associate and returned in 2018 as a principal. Walt was involved in the launch of:

  • Fulcrum Therapeutics
  • Goldfinch Bio

Walt was integral in the creation and building of Fulcrum Therapeutics, joining the company full time to lead strategy, business development, and operations. As part of the leadership team, he was involved in advancing the pipeline to its first clinical candidate and growing the company to 40+ employees. Walt has also worked in strategy consulting with Clarion Healthcare developing new business strategies and providing commercial insight into early product development in the rare disease space. He has a Ph.D. in chemical biology from Harvard University and a B.S. in biochemistry, molecular biology, and philosophy from Gettysburg College. Walt is also a member of Corporate Advisory Council for National Tay-Sachs and Allied Diseases (NTSAD).

Walt's first job was a paper route, which he used to do on roller blades.

Administrative Support

Megan Lamb
Executive Assistant
mlamb@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

At Third Rock, people are our most valuable asset

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Third Rock Careers