It's possible that:
* The name is misspelled. Perhaps you're thinking of a different author with a similar name.
* The author is relatively unknown. They might be a self-published author or one who focuses on a niche genre.
* You're thinking of a fictional character. It's possible the name "Thaddeus Davids" belongs to a character in a book or film.
Could you provide more information about the author or the works you're looking for? This would help me identify them more accurately.