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About
Jeb Keiper has over two decades in biotech leadership and strategic transactions. He was CEO of Nimbus Therapeutics from 2014 to 2025, where the company raised over $600 million and oversaw the zasocitinib deal with Takeda. He earlier held senior business development roles at GSK Oncology and worked at Pfizer, McKinsey, and TransForm Pharmaceuticals.
Invests in
BiotechHealthtechMedical Devices
Deals · 2
Strand TherapeuticsBoard seat
via Third Rock Ventures · filed Mar 2026 · $120.1M raise
Cardurion Pharmaceuticals, Inc.Board seat
via Third Rock Ventures · filed Nov 2019 · $10M raise
Attribution from SEC filings, press coverage, and firm rosters.
Colleagues at Third Rock Ventures
Frequently asked questions
- Who is Jeb Keiper?
- Jeb Keiper has over two decades in biotech leadership and strategic transactions. He was CEO of Nimbus Therapeutics from 2014 to 2025, where the company raised over $600 million and oversaw the zasocitinib deal with Takeda. He earlier held senior business development roles at GSK Oncology and worked at Pfizer, McKinsey, and TransForm Pharmaceuticals.
- Where does Jeb Keiper work?
- Jeb Keiper is Venture Partner at Third Rock Ventures.
- What does Jeb Keiper invest in?
- Jeb Keiper invests in Biotech, Healthtech, Medical Devices.
- What boards does Jeb Keiper sit on?
- Jeb Keiper holds tracked board seats at Cardurion Pharmaceuticals, Inc., Strand Therapeutics.
About this profile. Compiled from public sources — Third Rock Ventures's own website, regulatory filings and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights