[5] After serving as a graduate assistant under Butch Davis at North Carolina for one season, Gattis was hired as the wide receivers coach at Western Michigan in 2011.

While on the Broncos staff, he coached consensus All-American wide receiver Jordan White.

Gattis followed head coach James Franklin as he moved from Vanderbilt to Penn State in 2014, and assumed the same role with the Nittany Lions.

[7] He served as co-offensive coordinator (with Mike Locksley) and wide receivers coach during the 2018 season at Alabama, helping to oversee the third-highest scoring offense in the country.

[9] In 2021, Gattis won the Broyles Award as the top assistant coach in college football, leading the Wolverines' offense to a Big Ten Conference Championship and an appearance in the College Football Playoff.