Summers began his coaching career in 2002 at
Tift County High School in Tifton, Georgia, his alma mater. He then returned to Presbyterian in 2003, this time as defensive backs coach. After serving as a graduate assistant at
Troy (then Troy State) and
Georgia, Summers coached safeties at
Georgia Southern in 2006 before coaching linebackers and eventually safeties at
UAB for five seasons under
Neil Callaway, the offensive coordinator/offensive line coach at Georgia while Summers was a GA with the Bulldogs. From 2012-2014, Summers was on the staff at
UCF, eventually being named defensive coordinator and overseeing a unit that ranked 5th in the country in total defense in 2014. In 2015, Summers reunited with another former Georgia assistant,
Mike Bobo, at
Colorado State, where he was the defensive coordinator and safeties coach. On December 21, 2015, Summers returned to Georgia Southern as the program's 14th head coach and 2nd in the Eagles' FBS era, replacing
Willie Fritz, who left for the same position at
Tulane. Despite winning their first three games in the
2016 season, the Eagles went just 2-7 the rest of the way to finish 5-7, their first losing season since 2009. Their conference mark was 4-4, good for 6th in the
Sun Belt Conference. Summers'
second season in Statesboro opened with a 41-7 loss at then-No. 12 Auburn. The next week, in Birmingham, Alabama, Georgia Southern lost to FCS program New Hampshire, 22-12, followed by losses against Indiana, Arkansas State, and New Mexico State. On October 22, 2017, a day after a 55-20 loss at UMass dropped the Eagles to 0-6 on the season, Summers was fired and replaced by assistant coach
Chad Lunsford. For the 2018 season, Summers returned to Georgia, joining
Kirby Smart's staff as a defensive quality control coach. In 2019, he was named defensive coordinator at
Colorado under
Mel Tucker and was retained by Karl Dorrell after Tucker's departure, but was fired after two seasons. In 2021, Summers was a defensive assistant at
Florida. On February 13, 2022, Summers was named the defensive coordinator at
Western Kentucky. Longtime collegiate and professional coach
Kim Helton, the father of WKU's head coach,
Tyson Helton, was on Neil Callaway's staff at UAB with Summers from 2007-2011; the elder Helton also coached Summers' father, Andy, at Florida in the 1970s.
Clay Helton, Tyson Helton's older brother, is the current head coach of Summers' former Georgia Southern program. In 2025, Summers returned to Colorado State as the defensive coordinator. Midway through the 2025 season, head coach
Jay Norvell was fired, and Summers was named interim head coach for the remainder of the season. New head coach
Jim Mora retained Summers for the 2026 season. ==Head coaching record==