Jonathan Leff is a Partner on the Therapeutics team at Deerfield Capital Management. See sector focus and contact routes.
Jonathan Leff is a Partner on the Therapeutics team at Deerfield Capital Management, where he joined in 2013 to focus on venture capital and structured investments in biotechnology and pharmaceuticals. Prior to Deerfield, he led biotechnology and pharmaceutical investment efforts at Warburg Pincus for over sixteen years. His investment thesis centers on venture-stage biotechnology and pharmaceutical companies, with a sector focus on novel therapies, diagnostics, and medical devices addressing unmet medical needs. While specific check sizes and lead/follow behavior are not publicly detailed, he actively leads financing rounds, such as the $32 million agreement for Advanced Medicine Partners. Notable portfolio companies include Advanced Medicine Partners and Jaguar Gene Therapy, where he serves on the board. Leff distinguishes himself through active engagement in public policy on healthcare innovation and former leadership of the NVCA’s Medical Innovation and Competitiveness Coalition. He holds an M.S. in Biotechnology from Johns Hopkins and serves on multiple healthcare company boards and nonprofit organizations.
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