- It was the drama coach at his high school, Nancy Giovannoni, who thought Mark had a natural talent for acting. She teased him into auditioning for the school play his senior year, and gave him the lead role, Hawkeye Pierce in "M*A*S*H." He was a big hit and quickly decided to pursue an acting career after graduation.
- He played football when he was a student at West Leyden High School in Northlake, Illinois, a Chicago suburb close to O'Hare Airport.
- Buried at Queen of Heaven Cemetery in Hillside, Illinois.
- Like many athletes at his high school, he took an English elective called "Sports in Literature," which was taught by the school's drama coach, Nancy Giovannoni. The students read novels with sports themes, like Brian's Song.
- Appeared as a contestant on Episode #4792D of The Price Is Right (aired 2/8/83), making it up on stage and winning prizes in the Clock Game but going over in the Showcase Showdown spins.
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