It's possible that:
* The name is misspelled. Please double-check the spelling.
* The person works behind the scenes. Robert Amper might be a writer, producer, or director who doesn't have an on-screen presence.
* He is a relatively unknown figure. There could be many talented individuals who are not widely known.
To get more accurate information, it would be helpful to know more about Robert Amper:
* What kind of projects are you looking for? (Movies, TV shows, documentaries, etc.)
* Is there anything else you know about him? (For example, his role, the approximate year of the project, or the genre).
With more information, I might be able to find the information you are looking for.