It's possible that:
* He is not a professional actor or filmmaker: He might have participated in local productions, student films, or amateur projects that aren't widely documented.
* He uses a different name: There might be another name he uses professionally.
* His projects are unreleased: He might have worked on films or television shows that haven't been released yet.
To get a more definitive answer, you'd need to provide more information about George Stavropoulos, such as his location, date of birth, or any other details about his career.