It's possible that:
* The name is misspelled. Perhaps you meant a different name, and a simple spelling correction could lead you to the right person.
* The person is relatively unknown. They might be a smaller-scale actor, writer, or director with limited public recognition.
* They're not in the entertainment industry at all. There might be a person named Ollie Marland in another profession.
If you can provide more details, such as a specific role, production company, or time period, it might be easier to pinpoint the person you're looking for.