* The name is misspelled: Perhaps you're thinking of a similar name, like Walter Protheroe or another variation.
* The author is less known: It's possible the author is relatively unknown or publishes in a niche genre.
* The author is using a pen name: Authors often use pseudonyms, so the real name might be different.
To help me find the right author, could you please provide more information?
* What kind of books do you think they write? (genre, subject matter)
* Do you have any titles or excerpts of their work?
* Where did you encounter this name? (website, book cover, etc.)
With more details, I can assist you better in finding the author you're looking for.