* The name is misspelled. Perhaps there's a similar name like "Hal Scheel" or "Hal Shell". Double-check the spelling.
* The author is not well-known. They may be a newer author or have written in a niche genre.
* The author uses a pen name. They might publish under a different name than "Hal Schell".
To help me find information, could you provide any more context? For example:
* What genre are you interested in?
* Do you have any other information about the author? (e.g., a book title, a publication date, or a place they are from).
With more information, I can try to find the author you are looking for.