![Jonathan Leff](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Jonathan Leff
Director/Board Member at
MELINTA THERAPEUTICS, INC.
Net worth: - $ as of 2026-05-30
Profile
Jonathan S.
Leff currently works at Deerfield Institute, as Chairman from 2013, Biotechnology Innovation Organization, as Director-Emerging Companies Section Board, Chondrial Therapeutics, Inc., as Director, and various other companies.
Mr. Leff also formerly worked at Neurogen Corp., as Director from 2004 to 2008, Warburg Pincus LLC, as Managing Director, Transkaryotic Therapies, Inc., as Director in 2005, and various other companies.
Mr. Leff received his undergraduate degree from Harvard University, graduate degree from The Johns Hopkins University, and Masters Business Admin degree from Stanford Graduate School of Business.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 2026-05-18 | 0 ( -.--% ) | - $ | 2026-05-30 |
Jonathan Leff active positions
| Companies | Position | Start |
|---|---|---|
| MELINTA THERAPEUTICS, INC. | Director/Board Member | 2020-04-19 |
| LARIMAR THERAPEUTICS, INC. | Director/Board Member | 2020-05-27 |
Reagan-udall Foundation
 Reagan-udall Foundation The Reagan-Udall Foundation is a non-profit company dedicated to advancing regulatory science and innovation. The company is based in Washington, DC. The foundation collaborates with various stakeholders to enhance public health and safety through research and development initiatives. Susan C. Winckler has been the CEO of the company since 2020. | Director/Board Member | - |
Chondrial Therapeutics, Inc.
 Chondrial Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Develops orphan drugs for mitochondrial diseases | Director/Board Member | - |
Dracen Pharmaceuticals, Inc.
 Dracen Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Manufactures and distributes pharmaceutical products | Director/Board Member | - |
Deerfield Institute | Chairman | 2012-12-31 |
Friends of Cancer Research
 Friends of Cancer Research Miscellaneous Commercial ServicesCommercial Services Operates an organization for healthcare development | Director/Board Member | - |
Chondrial Therapeutics Holdings LLC
 Chondrial Therapeutics Holdings LLC Miscellaneous Commercial ServicesCommercial Services Operates as a biotechnology company | Director/Board Member | - |
Deerfield Management Co. LP (Private Equity)
 Deerfield Management Co. LP (Private Equity) Investment ManagersFinance Deerfield Management invests in both private and public companies located in the United States. The firm targets companies operating in the fields of diagnostic, digital health, life science, medical device, and health care services. It provides financing for pre-seed, seed, early, later and growth stage capital requirements. | Private Equity Investor | 2012-12-31 |
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Former positions of Jonathan Leff
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Training of Jonathan Leff
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
78
1st degree connections
45
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 45 |
|---|---|
Neurogen Corp.
 Neurogen Corp. Pharmaceuticals: MajorHealth Technology Discovers and develops drugs | Health Technology |
Warburg Pincus LLC
 Warburg Pincus LLC Investment ManagersFinance Warburg Pincus invests in companies located across the globe. The firm focuses on a broad range of sectors and industries. It provides financing for buyout transactions. | Finance |
Transkaryotic Therapies, Inc.
 Transkaryotic Therapies, Inc. Miscellaneous Commercial ServicesCommercial Services Develops and markets biopharmaceutical products | Commercial Services |
Allos Therapeutics, Inc.
 Allos Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Manufactures and markets anti-cancer therapeutics | Health Technology |
InterMune, Inc.
 InterMune, Inc. BiotechnologyHealth Technology Operates as a biotechnology company that researches and develops therapies in pulmonology & orphan fibrotic diseases | Health Technology |
Inspire Pharmaceuticals, Inc.
 Inspire Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Develops and commercializes ophthalmic products | Health Technology |
ZymoGenetics, Inc.
 ZymoGenetics, Inc. Pharmaceuticals: MajorHealth Technology Develops protein based drugs | Health Technology |
Sophiris Bio, Inc.
 Sophiris Bio, Inc. Pharmaceuticals: MajorHealth Technology Develops pharmaceutical products for the treatment of urological diseases | Health Technology |
Proteon Therapeutics, Inc.
 Proteon Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Operates as a biopharmaceutical company which develops pharmaceuticals products for patients with renal and vascular disease | Health Technology |
Sunesis Pharmaceuticals, Inc.
 Sunesis Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Develops oncology therapeutics for treatment of solid and hematologic cancers | Health Technology |
Biotechnology Innovation Organization
 Biotechnology Innovation Organization Miscellaneous Commercial ServicesCommercial Services Operates as a biotechnology advocacy organization representing biotech companies, industry leaders and state biotech associations | Commercial Services |
Zevra Therapeutics, Inc.
 Zevra Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Develops, manufactures and markets proprietary prodrugs | Health Technology |
Chondrial Therapeutics, Inc.
Chondrial Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Develops orphan drugs for mitochondrial diseases | Health Technology |
Harvard University
 Harvard University Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
ReSearch Pharmaceutical Services LLC
 ReSearch Pharmaceutical Services LLC Miscellaneous Commercial ServicesCommercial Services Provides clinical research services to the bio-pharmaceutical industry | Commercial Services |
Talon Therapeutics, Inc.
 Talon Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Develops and commercializes pharmaceutical products | Health Technology |
The Johns Hopkins University
 The Johns Hopkins University Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Warburg Pincus & Company US LLC
 Warburg Pincus & Company US LLC Investment ManagersFinance Operates as a private equity firm | Finance |
Altus Pharmaceuticals, Inc.
 Altus Pharmaceuticals, Inc. BiotechnologyHealth Technology Develops therapeutic products for gastrointestinal and metabolic diseases | Health Technology |
Melinta Subsidiary Corp.
 Melinta Subsidiary Corp. Pharmaceuticals: MajorHealth Technology Develops and markets pharmaceutical products for the treatment of life-threatening infections | Health Technology |
Archimedes Pharma Ltd.
 Archimedes Pharma Ltd. Pharmaceuticals: MajorHealth Technology Develops therapeutics for the treatment of chronic and debilitating illnesses | Health Technology |
National Venture Capital Association
 National Venture Capital Association Miscellaneous Commercial ServicesCommercial Services Provides business association services | Commercial Services |
Alita Pharmaceuticals, Inc.
 Alita Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Develops, manufactures, and distributes urologic and female healthcare products | Health Technology |
GANIC Pharmaceuticals, Inc.
 GANIC Pharmaceuticals, Inc. Drugstore ChainsRetail Trade Develops and markets pharmaceutical products | Retail Trade |
Columbia University Medical Center
 Columbia University Medical Center Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Spinal Muscular Atrophy Foundation
 Spinal Muscular Atrophy Foundation Miscellaneous Commercial ServicesCommercial Services Provides spinal muscular atrophy healthcare services | Commercial Services |
Nivalis Therapeutics, Inc.
 Nivalis Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Engages in discovery and development of products for patients with cystic fibrosis | Health Technology |
Friends of Cancer Research
Friends of Cancer Research Miscellaneous Commercial ServicesCommercial Services Operates an organization for healthcare development | Commercial Services |
Reagan-udall Foundation
Reagan-udall Foundation The Reagan-Udall Foundation is a non-profit company dedicated to advancing regulatory science and innovation. The company is based in Washington, DC. The foundation collaborates with various stakeholders to enhance public health and safety through research and development initiatives. Susan C. Winckler has been the CEO of the company since 2020. | |
Syros Pharmaceuticals, Inc.
 Syros Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Operates as a biopharmaceutical company which developing care for the frontline treatment of patients with hematologic malignancies | Health Technology |
Astellas Gene Therapies, Inc.
 Astellas Gene Therapies, Inc. BiotechnologyHealth Technology Develops and commercializes gene therapy products for patients with serious rare diseases | Health Technology |
Stanford Graduate School of Business
 Stanford Graduate School of Business Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Novartis Gene Therapies, Inc.
 Novartis Gene Therapies, Inc. BiotechnologyHealth Technology Operates as a clinical-stage gene therapy company | Health Technology |
Deerfield Management Co. LP (Private Equity)
Deerfield Management Co. LP (Private Equity) Investment ManagersFinance Deerfield Management invests in both private and public companies located in the United States. The firm targets companies operating in the fields of diagnostic, digital health, life science, medical device, and health care services. It provides financing for pre-seed, seed, early, later and growth stage capital requirements. | Finance |
Adaptive Phage Therapeutics, Inc.
 Adaptive Phage Therapeutics, Inc. Miscellaneous Commercial ServicesCommercial Services Operates as a clinical-stage biotechnology company that develops therapies for bacterial infections | Commercial Services |
Melinta Therapeutics, Inc.
 Melinta Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Operates as a commercial-stage company and develops innovative therapies for acute and life-threatening illnesses | Health Technology |
Dracen Pharmaceuticals, Inc.
Dracen Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Manufactures and distributes pharmaceutical products | Health Technology |
Deerfield Institute | |
ARS Subsidiary, Inc.
 ARS Subsidiary, Inc. Pharmaceuticals: MajorHealth Technology Develops epinephrine nasal sprays for treatment of severe allergic reactions | Health Technology |
Mirum Pharmaceuticals, Inc.
 Mirum Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Operates as clinical-stage therapeutics company developing a novel approach for treating cholestasis liver diseases | Health Technology |
Chondrial Therapeutics Holdings LLC
Chondrial Therapeutics Holdings LLC Miscellaneous Commercial ServicesCommercial Services Operates as a biotechnology company | Commercial Services |
BiomX, Inc.
 BiomX, Inc. BiotechnologyHealth Technology Operates as a clinical-stage biotechnology company developing natural and engineered phage cocktails designed to target and destroy bacteria that affect the appearance of skin | Health Technology |
Larimar Therapeutics, Inc.
 Larimar Therapeutics, Inc. BiotechnologyHealth Technology Operates as a clinical-stage biotechnology company focused on developing treatments for complex rare diseases | Health Technology |
Jaguar Gene Therapy LLC
 Jaguar Gene Therapy LLC Medical/Nursing ServicesHealth Services Provides gene therapy for patients | Health Services |
ARS Pharmaceuticals, Inc.
 ARS Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Develops pharmaceuticals | Health Technology |
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