Leonard Schleifer Biography: Wife, Ethnicity, Net Worth, Awards, Age, Religion, Height
Leonard S. Schleifer, widely recognized as Leonard Schleifer, is an American physician, businessman, entrepreneur and biotechnology executive best known as the founder, president and chief executive officer of Regeneron Pharmaceuticals.
A neurologist by training, he established Regeneron in 1988 and, alongside scientist George D. Yancopoulos, built the company into a leading biotechnology enterprise responsible for medicines including Eylea, Dupixent and Praluent.
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| Real Name: | Leonard S. Schleifer |
| Stage Name: | Leonard Schleifer |
| Born: | 7 July 1952 (age 74 years old) |
| Place of Birth: | Queens, New York City, New York, United States |
| Nationality: | American |
| Ethnicity: | Ashkenazi Jewish American |
| Religion: | Judaism |
| Parents: | Charles Baker Schleifer, Florence Schacht Schleifer |
| Spouse: | Harriet Partel Schleifer (1977) |
| Relationship: | Married |
| Children: | Adam P. Schleifer, David Benjamin Schleifer |
| Occupation: | Physician, Businessman, Entrepreneur, Biotechnology Executive |
| Net Worth: | $2.9 billion |
Early Life and Education
Leonard Schleifer was born on 7 July 1952 in Queens, New York City, to Charles Baker Schleifer and Florence Schacht Schleifer.
His father was a sweater manufacturer and a World War II codebreaker who had attended Cornell University on scholarship, while his mother helped nurture a household strongly focused on education. Information about his siblings has not publicly disclosed.
After graduating from Forest Hills High School, Leonard attended Cornell University and earned a bachelor’s degree before pursuing advanced medical and scientific training at the University of Virginia.
He received both his M.D. and Ph.D. in pharmacology and studied under Alfred G. Gilman, who later received the Nobel Prize in Physiology or Medicine.
Schleifer subsequently trained in neurology at New York Hospital and joined the Cornell medical faculty, establishing himself as both a practicing neurologist and academic before moving into biotechnology. His heritage is Ashkenazi Jewish American, and he practices Judaism.
Career
Leonard Schleifer began his medical career as a neurologist and junior faculty member at New York Hospital and Cornell, where he became increasingly interested in the emerging biotechnology industry.
His frustration with the limited treatments available for neurological disorders such as Parkinson’s and Alzheimer’s disease encouraged him to pursue a more direct role in developing new medicines.
In 1988, he founded Regeneron with the goal of using biotechnology to create innovative therapies, later recruiting George D. Yancopoulos as the company’s founding scientist.
Under Schleifer’s leadership, Regeneron developed from a young biotechnology venture into a major pharmaceutical company, overcoming early setbacks before producing breakthrough medicines.
Eylea became a major commercial success in treating retinal diseases, while later products including Dupixent and Praluent expanded the company’s reach into immunology and cardiovascular medicine.
Schleifer has remained president and CEO since Regeneron’s founding and became co-chair of its board in 2023.
His leadership has earned honors including the Biotechnology Heritage Award, Ernst & Young Life Sciences Entrepreneur of the Year, Barron’s Best CEOs recognition, the Walter Reed Distinguished Achievement Award and election as a fellow of the American Association for the Advancement of Science.
Personal Life
Leonard Schleifer, 74 years old, has been married to Harriet Partel Schleifer since 1977.
The couple have two sons, Adam P. Schleifer and David Benjamin Schleifer, and have maintained a long-standing family life alongside extensive philanthropic involvement.
Their son David has received particular family support because of a rare genetic condition, while Adam has also been connected to the family’s financial interests through a trust.
Net Worth
Leonard Schleifer has an estimated net worth of $2.9 billion. His wealth is derived primarily from his substantial ownership of Regeneron Pharmaceuticals, the biotechnology company he founded in 1988, together with executive compensation and other investments.
His approximately 2% ownership of Regeneron represents the principal source of his multibillion-dollar fortune.
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