Investor profile
Walter Kowtoniuk
Accelerator, Venture capital & Venture Partner at Third Rock Ventures
Walter Kowtoniuk is a Venture Partner at Third Rock Ventures, whose known portfolio counts 11 companies.
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Investment focus
- Sector
- AIHealthcare
- Focus
- BiotechCellular TherapyDiagnosticsDrug DiscoveryGeneticsGenomicsLife SciencePharmaPrecision MedicineScience-FirstTherapeuticsVenture Creation
Contacts
Affiliated funds' portfolios
Venture Partner at Third Rock Ventures, whose known portfolio counts 11 companies
- Maze Therapeutics
- Terremoto Biosciences
- Corvia Medical
- Azalea Therapeutics
- Syremis Therapeutics
- ARTBIO
- Seaport Therapeutics
- Merida Biosciences
- Trace Neuroscience
- Marea Therapeutics
- Synnovation Therapeutics
Investor Profile
Walter Kowtoniuk is listed against sectors AI and Healthcare, and focus areas Biotech, Cellular Therapy, Diagnostics and Drug Discovery in the database.
Third Rock Ventures appears in Growth, Seed and Series A rounds across its known deals.
The firm portfolio and the focus above give founders context on whether Walter Kowtoniuk matches their raise.
Colleagues at Third Rock Ventures
Showing 20 of 21
Philip Reilly
Venture Partner
Concord, United States
Mark Levin
Partner
Boston, United States
Richard Ransohoff
Venture Partner
Boston, United States
Neil Exter
Retired Partner
Palm Beach Gardens, United States
David Kaufman
Partner
Boston, United States
Jeffrey Tong
Partner
Menlo Park, United States
Alan Ezekowitz
Advisory Partner
Boston, United States
Reid Huber
Partner
Boston, United States
Noreen Rizvi
Principal
San Francisco, United States
Vyas Ramanan
Venture Partner
Boston, United States
Kevin Gillis
COO / Partner
Framingham, United States
Hugo Hilton
Principal
San Francisco, United States
Charlie Petty
Board Member - Stealth NewCo
New York City, United States
Jeff Finer
Venture Partner
South San Francisco, United States
Cary Pfeffer
Partner
Boston, United States
Robert Tepper
Partner
Boston, United States
Corey O'Keeffe
Investor
Boston, United States
Andrea van Elsas
Partner
Berkeley, United States
John Keilty
Venture Partner
Boston, United States
Abbie Celniker
Partner
Waban, United States
Frequently asked questions
Who is Walter Kowtoniuk?
Walter Kowtoniuk is an accelerator partner and venture capital investor based in Boston, Massachusetts, United States, listed as Venture Partner at Third Rock Ventures. The known portfolio of that firm counts 11 companies. That portfolio belongs to the firm, not to Walter Kowtoniuk personally.
What does Walter Kowtoniuk invest in?
Listed sectors include AI and Healthcare; listed focus areas include Biotech, Cellular Therapy, Diagnostics and Drug Discovery. Those tags come from the portfolios of the firms this profile is attached to, so they read as a record of what has been backed rather than a stated preference for what comes next.
What stage does Walter Kowtoniuk invest at?
Third Rock Ventures appears in Growth, Seed and Series A rounds across its known deals, and Walter Kowtoniuk is listed there as Venture Partner. Stage is the strongest single filter when you build a target list: an investor with no record at your stage rarely starts with you.
Which firm is Walter Kowtoniuk listed at?
Walter Kowtoniuk is listed as Venture Partner at Third Rock Ventures. 21 other people in the database share a firm with Walter Kowtoniuk.
How do I contact Walter Kowtoniuk?
An email address, a phone number and a LinkedIn page are on file for Walter Kowtoniuk. The address stays masked on this page and is readable inside RaiseHunt after you create an account.
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Data: RaiseHunt investor dataset · Snapshot 5 September 2026 · How this data is built · Report a correction or request removal