It's possible:
* There's a typo: Perhaps the author's name is spelled differently, or you're thinking of a different author entirely.
* The author is relatively unknown: New or niche authors may not have a large online presence.
* The author uses a pen name: Some authors choose to use pseudonyms.
To find out more, you could:
* Check online book databases: Try searching for "M B Longman" on websites like Goodreads, Amazon, or LibraryThing.
* Search for books by genre: If you know what genre the author writes in, you can narrow your search.
* Ask a librarian: Librarians can often help you track down information about authors.
Please provide more context or details about the author or their work, and I can try to help you find more information.