Calnan noted in an interview that he "graduated high school and then went to the School of Visual Arts, which at that time was the cartoonists and illustrators school where I met Tom Gill and inked The Lone Ranger and also worked on other Westerns, including Cheyenne. So that was my introduction into the field." He later became an advertising art director and TV producer for agencies, while keeping the comic work "on the side".
Professional History of John Calnan is unknown.
- John Calnan's Images as a Penciler
- John Calnan's Images as an Inker
- John Calnan's Images as a Cover Artist