It's possible that:
* You are thinking of a different name. Double-check the spelling and ensure you have the correct information.
* The individual is not well-known. There are many talented actors and crew members who work behind the scenes, and their names might not be widely recognized.
* The person may be a local talent. They could be involved in theater or independent film projects that haven't gained mainstream recognition.
If you have more information about Roger Anderson (like his hometown, profession, or any specific movie/TV show he might have been in), I might be able to help you further.