I couldn't find information on an author named Geoffrey C. Fuller from my current knowledge base, which is up to date as of early 2023. It is possible that he may be an author with a smaller body of work or one who has recently come into prominence, and thus less information is widely available. Alternatively, he may share a similar name with other authors, or the name could have been misspelled. Authors with smaller or developing portfolios often have limited presence until they publish a breakout piece or receive significant recognition. If Geoffrey C. Fuller is an emerging author, more information may become available in the future. If you have specific works or contexts associated with him, I might be able to give you more precise information or suggest where to look for updates on his career and writings.