According to Rick Walsh of KDKA, there are five candidates, but thus far he knows of only four. Those four are:
Vince Nicastro- He's been the athletic director at Villanova for 15 years so needless to say he has a lot of experience. He got his undergraduate degree from Bloomsburg State, and his MBA from St. Joseph's University in Philadelphia. He's in his early 50s.
Mark Coyle- He's been the athletic director at Boise State for almost 3 and a half years. In 2014-15, Boise State won the conference championship in football, and both men's and women's basketball.