"Obviously, Billy's experience gives us that person to serve as my aide in administrative matters and with the overall day-to-day operations of Mountaineer basketball."
Hahn came to West Virginia with Huggins in 2007 and had served as a full-time assistant since. He was an assistant coach under Gary Williams at Maryland for 12 seasons and the head coach at La Salle for three years.
Calhoun has also been part of Huggins' Mountaineer staff since the head coach came to Morgantown, serving four seasons as director of basketball operations.
Previously, he was an assistant coach at Walsh College for three seasons -- the first of which was an NAIA national championship run in 2005. He was a student assistant under Huggins at Cincinnati in 2003-04.
"This change certainly opens up tremendous opportunities for Jerrod and one he will take full advantage of," Huggins said. "We look forward to his exuberance in terms of recruiting."