It is possible that he may have been involved in smaller productions or projects that are not widely known.
To find more information, you might try searching online using specific keywords related to his potential involvement in a particular genre or production company. You could also look for databases of actors or crew members on websites like IMDb.
If you have any other details about Glenn Hazeldine, such as his full name, location, or specific time period of interest, it may help in finding more information about his career.