Zettergren will begin his third season and his second as the offensive coordinator on the Concord football staff in 2019. Zettergren served as quarterbacks coach during the 2017 season before being promoted to offensive coordinator during the spring of 2018.

With Zettergran calling the offense for the Mountain Lions in the fall of 2018, Concord enjoyed its most successful offensive season since 2015 as it scored 27 points per game and averaged over 325 yards of offense per contest. Quarterback Kyle Akin threw for 14 touchdowns in nine games

During his only season as the CU quarterbacks coach, Zettergren mentored true freshman Adam Fulton into one of the best freshman signal callers in all of Division. In eight starts, Fulton threw for 1,128 years and 10 touchdowns.

Prior to joining Paul Price's staff at Concord, Zettergren was an assistant on the Tennessee-Martin staff.

Zettergren helped the Skyhawks to a 7-5 record in 2016 after starting the season 0-2. Before stops at UT-Martin and St. George's (HS) in Collierville, Tennessee, Zettergren helped turn around Trinity Christian Academy in Jackson, Tennessee as the offensive coordinator. During his first season in 2011, TCA went 3-7, but in Zettergren's final two seasons Trinity Christian was 20-4.

Before starting his coaching career, Zettergren lettered at Ole Miss as a wide receiver.