It's possible that:
* The name is misspelled. Double-check the spelling of the name.
* The person is not a major actor. They might have worked on small projects or behind the scenes.
* The person uses a different name professionally.
To help me find more information, could you please provide more context?
* What role did they play? (lead, supporting, etc.)
* What genre of films or TV shows were they in?
* Do you remember any specific movies or shows?
* Do you have any other information about them?
With more information, I might be able to help you find the right Peter Mark Bockman.