It's possible that:
* The name is misspelled. Double-check the spelling and try searching again.
* The person is not well-known. There could be a less famous actor or filmmaker with this name who has worked on smaller projects.
* The person is not in the entertainment industry. It's possible the name belongs to someone in a different field.
If you can provide more information about Malcolm Ridley, such as their profession or any other details about their work, it might be easier to find them.