It's possible that he may be working under a different name, or his projects may be independent or unreleased.
To find more information about him, you could try:
* Searching online film databases: Websites like IMDb and Letterboxd often have extensive databases of film and television credits. You can search for his name to see if any results come up.
* Looking for local productions: If you know his location, you can research local theaters, film festivals, or independent production companies to see if he has been involved in any projects.
* Reaching out to film industry professionals: If you have connections in the film industry, you could ask them if they know anything about Martin Grelis.
Without more specific information, it's difficult to determine if Martin Grelis has been involved in any movie or television projects.