It's possible that:
* The name is misspelled. Double-check the spelling and try searching again.
* The person is not publicly known. It's possible he has worked on projects in a behind-the-scenes capacity, or his work may be relatively obscure.
* The information is not readily accessible online. It's possible he may have worked under a different name or on independent projects that don't have widespread online information.
If you have more information, like a potential birth year, location, or a specific project he might have been involved in, it might be easier to find him.