What has the author George Waller written?

There isn't enough information to determine who you're referring to. There are many people named George Waller, and it's impossible to know which one you're asking about without more context.

Please provide more details, such as:

* Full name: Is there a middle name or other identifying information about this George Waller?

* Profession: Is he an author, scientist, musician, or something else?

* Genre: What kind of books or works does he create (e.g., fiction, non-fiction, poetry)?

* Era: When did he live or work?

With more information, I can help you find out what George Waller has written.