Greg Johnson is an undercover agent for the CIA. Contents[show] HistoryEdit Early HistoryEdit . The Great Zoo of ChinaEdit . PersonalityEdit . TriviaEdit . This article is a stub. You can help the Matthew Reilly Wiki by expanding it. Retrieved from "https://matthewreilly.fandom.com/wiki/Greg_Johnson?oldid=10194" Categories: Article stubs Characters Main Characters The Great Zoo of China Protagonists U.S. Characters The Great Zoo of China Characters Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.