It's possible:
* There's a misspelling: Perhaps the name is slightly different.
* The author is less well-known: They might be a self-published author or write in a niche genre.
* The author uses a pen name: They may publish under a different name.
To help me find the author, could you provide more information?
* Do you have any specific titles or works associated with this author?
* What kind of writing are they known for (genre, style, themes)?
* Are there any other clues about the author, like their nationality or time period?
With more details, I might be able to help you track down John Henry Sherburne.