It's possible that:
* The name is misspelled: Double-check the spelling and try searching again.
* The author is not widely known: It might be an author who has published works in a niche genre or under a different name.
* The author is a pseudonym: Many authors use pseudonyms, so searching under other potential names could help.
To help me find more information, please provide any additional details you have about Rolf Johan Witting, such as:
* Genre of writing: What type of books or other writing does he produce?
* Approximate publishing date: When were his works published?
* Country of origin: Where is he from or where were his works published?
With more information, I might be able to find more information about him.