He served as the athletic director of the University of Maryland from 1981 to 1986, including during the death of Len Bias, which prompted Dull's resignation.
He suffered a serious injury to his elbow ligament, but recovered and finished as a runner-up in the state championship during his senior year in 1963.
[2] Dull attended college at the University of Maryland, where he continued competing in the javelin throw at the intercollegiate level.
[2] After receiving a Juris Doctor degree, he took a pay cut from $22,000 to $8,500 and became an assistant ticket manager at his alma mater.
[5] In January 1982, Dull hired Bobby Ross to succeed Jerry Claiborne as the school's head football coach.
[2] Dull was serving as athletic director when Maryland basketball star Len Bias died from a cocaine-induced heart attack in 1986.
[18] Dull eventually retired,[2] but returned to his work as the athletic director of Belmont Abbey College in June 2007.