![Leonard Schleifer](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>)
Leonard Schleifer
Chief Executive Officer at
REGENERON PHARMACEUTICALS, INC.
Net worth: 1 505 M $ as of 2026-06-29
Profile
Founder of Regeneron Pharmaceuticals, Inc., Leonard S. Schleifer is Co-President, Chief Executive Officer & Director at this company. He previously was Assistant Professor at Weill Cornell Medical College. Dr. Schleifer received a doctorate from the University of Virginia.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 2026-04-13 | 1,725,565 ( 82.56% ) | 1 076 M $ | 2026-06-29 | |
| 2026-04-13 | 688,088 ( 0.67% ) | 429 M $ | 2026-06-29 |
Latest news about Leonard Schleifer
Leonard Schleifer active positions
| Companies | Position | Start |
|---|---|---|
| REGENERON PHARMACEUTICALS, INC. | Chief Executive Officer | 1988-01-07 |
Regeneron Ireland DAC
 Regeneron Ireland DAC BiotechnologyHealth Technology Operates as a biotechnology company which develops medicines for serious diseases | Chief Executive Officer | 2012-12-31 |
Former positions of Leonard Schleifer
| Companies | Position | End |
|---|---|---|
Weill Cornell Medical College
 Weill Cornell Medical College Other Consumer ServicesConsumer Services Functions as a College/University | Corporate Officer/Principal | - |
Training of Leonard Schleifer
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
55
1st degree connections
5
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 5 |
|---|---|
Regeneron Pharmaceuticals, Inc.
 Regeneron Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Discovers, develops, manufactures and commercializes medicines for diseases | Health Technology |
University of Virginia
 University of Virginia Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Cornell University
 Cornell University Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Weill Cornell Medical College
Weill Cornell Medical College Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Regeneron Ireland DAC
Regeneron Ireland DAC BiotechnologyHealth Technology Operates as a biotechnology company which develops medicines for serious diseases | Health Technology |
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