Seifarth spent just one full season with the Nittany Lions.
Koebel will replace Rick Kaluza, a 1986 Penn State graduate who has served in the role since spring 2009.
Ryan Barker has made over 90% of his field goal attempts and remains perfect in extra point attempts through five games.
The world was a bit different three years ago.
A pair of former Penn State pass catchers reeled in their first touchdown grabs of the season during week five.
