It's possible that:
* The name is misspelled: Double check the spelling of the name and any relevant information.
* The theory is niche: The theory might be specific to a particular field or area of study that isn't widely known.
* The person is not a theorist: The person might be involved in a different field or have a different type of contribution.
To help me find the information you are looking for, please provide more context:
* What is the theory supposed to be about? What is the topic or field of study?
* Where did you hear about this theory? Was it in a book, article, or other source?
With more information, I can help you find the theory you're looking for.