Leonard S. Schleifer
E669585
Leonard S. Schleifer is an American physician, entrepreneur, and billionaire best known as the co-founder and longtime CEO of the biotechnology company Regeneron Pharmaceuticals.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Leonard S. Schleifer canonical | 5 |
How this entity was disambiguated
This entity first appeared as the object of triple T6251163 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Leonard S. Schleifer Context triple: [Regeneron Pharmaceuticals, foundedBy, Leonard S. Schleifer]
-
A.
Louis R. Lozowick
Louis R. Lozowick was a Russian-born American painter and printmaker known for his Precisionist cityscapes and industrial scenes, particularly in lithography.
-
B.
Harold T. Shapiro
Harold T. Shapiro is an economist and academic leader best known for serving as president of both Princeton University and the University of Michigan and for his influential work at the intersection of higher education and public policy.
-
C.
Frank E. Seidman
Frank E. Seidman was an influential figure in the field of political economy, honored by a distinguished award that bears his name.
-
D.
Sidney B. Kramer
Sidney B. Kramer was an American publisher best known as a co-founder of the mass-market paperback company Bantam Books.
-
E.
Larry A. Lebofsky
Larry A. Lebofsky is an American astronomer known for his work in planetary science and the study of ring systems around planets.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Leonard S. Schleifer Target entity description: Leonard S. Schleifer is an American physician, entrepreneur, and billionaire best known as the co-founder and longtime CEO of the biotechnology company Regeneron Pharmaceuticals.
-
A.
Louis R. Lozowick
Louis R. Lozowick was a Russian-born American painter and printmaker known for his Precisionist cityscapes and industrial scenes, particularly in lithography.
-
B.
Harold T. Shapiro
Harold T. Shapiro is an economist and academic leader best known for serving as president of both Princeton University and the University of Michigan and for his influential work at the intersection of higher education and public policy.
-
C.
Frank E. Seidman
Frank E. Seidman was an influential figure in the field of political economy, honored by a distinguished award that bears his name.
-
D.
Sidney B. Kramer
Sidney B. Kramer was an American publisher best known as a co-founder of the mass-market paperback company Bantam Books.
-
E.
Larry A. Lebofsky
Larry A. Lebofsky is an American astronomer known for his work in planetary science and the study of ring systems around planets.
- F. None of above. chosen
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
American Jew
ⓘ
entrepreneur ⓘ human ⓘ physician ⓘ |
| academicDegree |
Doctor of Medicine
ⓘ
PhD in pharmacology ⓘ |
| boardMemberOf | Regeneron Pharmaceuticals ⓘ |
| citizenship | United States of America ⓘ |
| coFounded | Regeneron Pharmaceuticals ⓘ |
| countryOfBirth | United States of America ⓘ |
| educatedAt |
Cornell University
ⓘ
University of Virginia ⓘ University of Virginia School of Medicine ⓘ
linked to:
University of Virginia Health System
|
| employer | Regeneron Pharmaceuticals ⓘ |
| familyName | Schleifer ⓘ |
| fieldOfWork |
biotechnology
ⓘ
drug development ⓘ pharmaceutical industry ⓘ |
| founded | Regeneron Pharmaceuticals ⓘ |
| gender | male ⓘ |
| givenName | Leonard ⓘ |
| hasChild | Adam Schleifer ⓘ |
| hasNetWorthStatus | billionaire ⓘ |
| industry |
biotechnology industry
ⓘ
pharmaceutical industry ⓘ |
| knownFor |
leadership in monoclonal antibody drug development at Regeneron
ⓘ
longest-serving CEO in the S&P 500 biotechnology sector ⓘ |
| languageSpoken | English ⓘ |
| memberOf |
American Academy of Arts and Sciences
ⓘ
National Academy of Sciences ⓘ |
| name | Leonard S. Schleifer ⓘ |
| notableFor |
co-founding Regeneron Pharmaceuticals
ⓘ
serving as CEO of Regeneron Pharmaceuticals ⓘ |
| notableWork | building Regeneron into a major biotechnology company ⓘ |
| occupation |
biotechnology entrepreneur
ⓘ
business executive ⓘ pharmaceutical industry executive ⓘ physician ⓘ |
| positionHeld |
Chief Executive Officer of Regeneron Pharmaceuticals
ⓘ
President of Regeneron Pharmaceuticals ⓘ |
| residence | New York ⓘ |
| workLocation | Tarrytown, New York ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Leonard S. Schleifer Description of subject: Leonard S. Schleifer is an American physician, entrepreneur, and billionaire best known as the co-founder and longtime CEO of the biotechnology company Regeneron Pharmaceuticals.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.