It's possible that:
* The name is slightly different: Double-check the spelling of the author's name. It's easy to misremember or misspell a name.
* The author uses a pen name: Many authors write under pseudonyms. Perhaps R.J. Kurtz is a pen name, and the author uses a different name for their legal work.
* The author is new or less known: There may be authors who are not yet well-established and their work is not widely available on public databases.
To help me find more information, could you please provide:
* Any additional information you have about the author: Do you know anything about their genre, the type of book they write, or any titles you might have seen?
* Where you found the author's name: Did you see it on a book, website, or other source?
With more details, I can try to help you find the information you're looking for!