Koebel will replace Rick Kaluza, a 1986 Penn State graduate who has served in the role since spring 2009.
Dunn scored 15 points in his club debut on Friday.
Penn State women's volleyball's matchup against Northwestern on Saturday, October 11, has been moved back an hour.
The Nittany Lions dropped three spots.
The Nittany Lions remain the second-best team in the Big Ten.
Gavin McKenna has signed a trading card and autograph deal with collectibles manufacturer Topps.