It's possible that:
* The name is misspelled. If you could provide the correct spelling, I might be able to find more information.
* The person is not well-known. If they're not a major actor or director, it's possible they haven't worked on projects that are widely documented.
* There are multiple people with this name. There could be several individuals named Jon Ernst, and the one you're looking for might not be publicly recognized.
To help me find information, please provide any additional details you might have, such as:
* The type of projects they're involved in (e.g., acting, directing, writing, producing)
* Approximate time period of their work
* Any other details you can remember
With more information, I might be able to help you find the Jon Ernst you're looking for.