It's possible that:
* The name is misspelled. Double-check the spelling.
* The author has a different name. Perhaps "G V Lachmann" is a pseudonym or an abbreviation of their real name.
* The author is not well-known. There may be lesser-known authors who haven't been widely published.
Could you provide more context? For example:
* What kind of books do you think they write? (fiction, non-fiction, etc.)
* Do you have any other details about them? (location, time period, etc.)
With more information, I might be able to assist you in finding more information about this author.