"I am extremely grateful to have been given the opportunity to be able to play and contribute for such a historic program," Levis said.
Dixon is expected to transfer to Michigan at this time, according to 247Sports' Allen Trieu.
Wilson started in 22 games in three seasons at Harvard and was named to the All-Ivy League second team in 2019
Three Nittany Lions are officially headed to Super Bowl LV.
Jones appeared in five games for the Nittany Lions this season.
O'Brien was an early candidate for the job after Steve Sarkisian left Tuscaloosa for the head coaching spot at Texas.