* The name is slightly incorrect: Perhaps the author's name is similar but spelled differently. Could you double-check the name?
* The author is less known: It's possible that "Billy Shepherd" is a pseudonym or an author who hasn't gained widespread recognition yet.
* There's a misunderstanding: You might be thinking of a different type of "Billy Shepherd" - a musician, artist, or someone in another field.
To help me find information about this author, could you tell me:
* Any details about their writing: What kind of books do they write? (fiction, non-fiction, children's books, etc.)
* Any other information you have: Do you know their nationality, when they were born, or anything else that could help narrow down the search?
With more information, I might be able to find more details about this author.