Clark, who began work on Monday, comes to Mississippi State after five seasons at the University of Florida, where he served as the Director of Football Administration.
"Jon is an experienced veteran in the ins-and-outs of a successful football program, and we're excited to bring him on board," Mullen said. "I've known Jon for nearly 10 years now and it's great to welcome him to the Mississippi State family."
Clark will oversee the administrative operations of the football department, including daily scheduling, budget, travel, office staff and other duties.
Prior to his stint at Florida, Clark served in the same role at the University of Utah in 2002 and 2003. He first worked with Florida head football coach Urban Meyer at Bowling Green, where Clark was an undergraduate student manager prior to earning his Bachelor's Degree in Secondary Education in May of 2002. After completing his education, Clark accepted a position as an administrative graduate assistant at BGSU.