[1] Mulligan played high school football at Calvert Hall where he helped lead them to a Baltimore Catholic League title in 1964.
He went to college at Clemson University where he was the starting center from 1966-1968 and helped the Tigers to consecutive ACC championships in 1966-1967.
Just a few days later, the Bears traded Mulligan to the New York Jets where he became Joe Namath's center for two seasons.
[3] Mulligan resides in South Carolina and is the father of three adult children: Stacey, Kelley, and Patrick; and the grandfather of eight.
This biographical article relating to an American football offensive lineman born in the 1940s is a stub.