Mark Leiter
E823077
Mark Leiter is a former Major League Baseball pitcher who played primarily in the 1990s and is part of a well-known baseball family.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Mark Leiter canonical | 4 |
| Mark Leiter Jr. | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T9198758 — 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: Mark Leiter Context triple: [Al Leiter, relative, Mark Leiter]
-
A.
Michael Leiters
Michael Leiters is an automotive executive known for senior leadership roles at high-performance sports car manufacturers, including serving as CEO of McLaren Automotive.
-
B.
Michael Leibert
Michael Leibert was an American theater director and producer best known for establishing the influential Berkeley Repertory Theatre in California.
-
C.
Mark Zeisler
Mark Zeisler is an American actor known for his supporting roles in film, television, and theater, including a part in the romantic comedy "Two Weeks Notice."
-
D.
Al Leiter
Al Leiter is a former Major League Baseball left-handed pitcher and current baseball analyst known for his successful career with teams like the Toronto Blue Jays, Florida Marlins, and New York Mets.
-
E.
Michael Wittenberg
Michael Wittenberg was an investment adviser best known as the late husband of Broadway star Bernadette Peters.
- 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: Mark Leiter Target entity description: Mark Leiter is a former Major League Baseball pitcher who played primarily in the 1990s and is part of a well-known baseball family.
-
A.
Michael Leiters
Michael Leiters is an automotive executive known for senior leadership roles at high-performance sports car manufacturers, including serving as CEO of McLaren Automotive.
-
B.
Michael Leibert
Michael Leibert was an American theater director and producer best known for establishing the influential Berkeley Repertory Theatre in California.
-
C.
Mark Zeisler
Mark Zeisler is an American actor known for his supporting roles in film, television, and theater, including a part in the romantic comedy "Two Weeks Notice."
-
D.
Al Leiter
Al Leiter is a former Major League Baseball left-handed pitcher and current baseball analyst known for his successful career with teams like the Toronto Blue Jays, Florida Marlins, and New York Mets.
-
E.
Michael Wittenberg
Michael Wittenberg was an investment adviser best known as the late husband of Broadway star Bernadette Peters.
- F. None of above. chosen
Statements (26)
| Predicate | Object |
|---|---|
| instanceOf |
baseball player
ⓘ
human ⓘ pitcher ⓘ |
| activeInPeriod | 1990s ⓘ |
| countryOfCitizenship | United States of America ⓘ |
| familyRelation |
brother of Al Leiter
ⓘ
father of Jack Leiter ⓘ uncle of Mark Leiter Jr. ⓘ |
| handedness | right-handed pitcher ⓘ |
| league | Major League Baseball ⓘ |
| memberOfSportsTeam |
Anaheim Angels
ⓘ
linked to:
Los Angeles Angels
California Angels ⓘ
linked to:
Los Angeles Angels
Detroit Tigers ⓘ Montreal Expos ⓘ New York Yankees ⓘ Philadelphia Phillies ⓘ San Francisco Giants ⓘ Seattle Mariners ⓘ |
| notableWork | Major League Baseball career in the 1990s ⓘ |
| occupation | Major League Baseball pitcher ⓘ |
| partOf | Leiter baseball family ⓘ |
| positionPlayed | pitcher ⓘ |
| sexOrGender | male ⓘ |
| sport | baseball ⓘ |
| sportingRole |
relief pitcher
ⓘ
starting pitcher ⓘ |
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: Mark Leiter Description of subject: Mark Leiter is a former Major League Baseball pitcher who played primarily in the 1990s and is part of a well-known baseball family.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.