At the time, his father Chris Cosh was the defensive line coach for the University of Minnesota football team.
[3] He transferred to James Madison after the season, following a visit from their head coach Mickey Matthews which convinced him there was an opportunity for him there.
[8] In his one season at Richmond, the Spiders had a top 20 offensive SP+ rating and advanced to the second round of the FCS playoffs.
[10] On December 13, 2023, Cosh was named the third head coach in Stony Brook Seawolves history.
[12] He won his first game as a head coach on September 7, 2024, against Stonehill, a 37–10 victory for Stony Brook.
[13] On October 26, 2024, Cosh's Seawolves defeated the 15th-ranked William and Mary Tribe 35–13, the program's first win against a ranked opponent since 2021.
[2] His older brother J.J. played college football for the Midshipmen of the United States Naval Academy from 2007 to 2011 and is currently a scout for the Chicago Bears.