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 Therapeutics Inc.Board 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
Abbie Celniker
Investor at Third Rock Ventures
Adam Tebbe
Investor at Third Rock Ventures
Alan Ezekowitz
Investor at Third Rock Ventures
Alison Connors
Investor at Third Rock Ventures
Amanda Chan
Investor at Third Rock Ventures
Andrea van Elsas
Investor at Third Rock Ventures
Andrew Warren
Senior Associate at Third Rock Ventures
Angelo Severino
Investor at Third Rock Ventures