It's possible you're thinking of a different name, or a less well-known author. To help me find the right John Grigsby, could you provide me with any additional information? For example:
* What kind of books do you think he wrote? (Fiction, non-fiction, genre, etc.)
* Do you remember any titles or characters from his work?
* Do you know roughly when he was writing?
With more details, I might be able to identify the author you're looking for.