He served as linebackers coach in 2004 and 2005 for the Kansas State Wildcats under head coach Bill Snyder, before returning to Maryland as their defensive coordinator and linebackers coach with head coach Ralph Friedgen.[1]
While at Maryland, Cosh was frequently criticized by fans for the inconsistent performance by Maryland's defense, which was described as "poor to occasionally impressive". Friedgen praised Cosh's recruiting but showed public frustration with Cosh's in-game coaching.[4]
On December 6, 2008, it was announced that Cosh would return to Kansas State for a second time under coach Snyder (when Snyder decided to come out of retirement to help the Wildcats) as assistant head coach (to Snyder) and co-defensive coordinator alongside Vic Koenning.[1][5]
Cosh will have now served as a defensive coordinator in five of the six BCS conferences (Big Ten, SEC, ACC, Big 12, and Big East).[1]
^"Archived copy". www.fansonly.com. Archived from the original on October 8, 1999. Retrieved January 12, 2022.{{cite web}}: CS1 maint: archived copy as title (link)