Mark played guard for Hillsboro, earning three varsity letters. He was twice named to the Mid-State All-Conference team and received special mention all-state in the Chicago Daily News. He was the leading scorer on the 1969 varsity boys basketball team that finished 20-8

While at Hillsboro High School, Mark set the all-time single game scoring record with 46 points. He is a member of the HHS 1,000 point club, tallying 1,202 points during his career.

Mark went on to play college basketball on an athletic scholarship to St. Louis University. He was a guard on the 1971 team that was inducted into the Billiken Hall of Fame. During his senior year at SLU, Mark earned both a sportsmaship award and special mention to the Missouri Valley All-Conference team.

After graduation, Mark returned to Litchfield as a coach and a teacher before taking the head coaching position at Belvidere High School in northern Illinois. At Belvidere he was named the Big 9 Boys Basketball Coach of the Year in 1992. Mark's girls basketball teams followed up a Final Four state appearance in 1992 with three consecutive Sweet Sixteen finishes.

Mark retired from a teaching career that spanned 32 years. In 1991, he was honored for teaching excellence with a "Those Who Excel Recognition Award."