Where does Jonathan Leff work?

Jonathan Leff is Partner at Deerfield Management Company.

What check size does Jonathan Leff write?

Jonathan Leff typically writes checks of $10M – $50M.

What boards does Jonathan Leff sit on?

Jonathan Leff holds tracked board seats at Aprecia Pharmaceuticals, Audentes Therapeutics, Dracen Pharmaceuticals, Elion Therapeutics, Innervace.

What companies has Jonathan Leff invested in?

Investments tracked here include Adaptive Phage Therapeutics, Altus Pharmaceuticals, Audentes Therapeutics, AveXis, Biomx, Dracen Pharmaceuticals, Hana Biosciences, Mirum Pharmaceuticals.

Jonathan Leff

Investor

Partner at Deerfield Management Company · Partner at Sofinnova Ventures

New York, New York

Writes $10M – $50M checks · typically $25M

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Deals · 5

Elion TherapeuticsBoard seat

via Deerfield Management Company · filed Jun 2024 · $83.8M raise

InnervaceBoard seat

via Deerfield Management Company · filed Aug 2022 · $40M raise

Dracen PharmaceuticalsBoard seat

via Deerfield Management Company · filed Jan 2018 · $40.5M raise

Aprecia PharmaceuticalsBoard seat

via Deerfield Management Company · filed Jan 2016 · $84M raise

Audentes TherapeuticsBoard seat

via Deerfield Management Company · filed Sep 2015

Attribution from SEC filings, press coverage, and firm rosters.

Other disclosed investments

Investor

Adaptive Phage TherapeuticsAltus PharmaceuticalsAveXis BiomxHana BiosciencesMirum Pharmaceuticals

Sources: SEC Form D filings · curated public sources.

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Colleagues at Deerfield Management Company

Abdul Khan

Senior Director, Biologics at Deerfield Management Company

Abraham Kometz

Partner at Deerfield Management Company

Adam Greene

Partner at Deerfield Management Company

Adriana Brito

Desktop Support Engineer at Deerfield Management Company

Alex Lachapelle

Director, Product and Strategy at Deerfield Management Company

Alexander Ashavsky

Managing Director, Data Science and Engineering at Deerfield Management Company

Alexis Cazé

Partner at Deerfield Management Company

Alison Stamas

Associate at Deerfield Management Company

Frequently asked questions

Who is Jonathan Leff?: Partner at Deerfield Management Company
Where does Jonathan Leff work?: Jonathan Leff is Partner at Deerfield Management Company.
What check size does Jonathan Leff write?: Jonathan Leff typically writes checks of $10M – $50M.
What boards does Jonathan Leff sit on?: Jonathan Leff holds tracked board seats at Aprecia Pharmaceuticals, Audentes Therapeutics, Dracen Pharmaceuticals, Elion Therapeutics, Innervace.
What companies has Jonathan Leff invested in?: Investments tracked here include Adaptive Phage Therapeutics, Altus Pharmaceuticals, Audentes Therapeutics, AveXis, Biomx, Dracen Pharmaceuticals, Hana Biosciences, Mirum Pharmaceuticals.