* The name is misspelled. Perhaps you're thinking of a different author with a similar name.
* The author is relatively unknown. They might be a self-published author or write in a niche genre.
* The author uses a pseudonym. It's possible the name "David Paul Larousse" is a pen name.
To help me find the author you're looking for, could you provide more details?
* What kind of books do they write? (Genre, themes, etc.)
* Have you seen any of their books? (Titles, covers, etc.)
* Where did you hear about them? (Online, in a bookstore, etc.)
With more information, I might be able to track down the author you're looking for!