UCLA In 2006, Lea began his coaching career at
UCLA as a graduate assistant under head coach
Karl Dorrell.
South Dakota State In 2007, Lea joined
South Dakota State University as their linebackers coach under head coach
John Stiegelmeier. In 2008, Lea was given an additional role as recruiting coordinator.
UCLA (second stint) In 2009, Lea returned to UCLA as a graduate assistant under head coach
Rick Neuheisel. In 2010, he was promoted to linebackers coach. Following Neuheisel's firing on November 28, 2011, Lea was not retained by UCLA for the 2012 season.
Bowling Green In 2012, Lea was hired as the linebackers coach at
Bowling Green State University under defensive coordinator
Mike Elko and head coach
Dave Clawson.
Syracuse In 2013, Lea joined
Syracuse University as their linebackers coach under head coach
Scott Shafer.
Wake Forest In 2016, Lea was hired as the linebackers coach at
Wake Forest University, reuniting with defensive coordinator
Mike Elko and head coach
Dave Clawson.
Notre Dame In 2017, Lea followed defensive coordinator Mike Elko to the
University of Notre Dame to serve as their linebackers coach under head coach
Brian Kelly. In January 2018, Lea was promoted to
defensive coordinator, replacing Mike Elko, who departed to serve in the same role at
Texas A&M.
Vanderbilt On December 14, 2020, Lea was named the 29th head football coach at
Vanderbilt University, replacing
Derek Mason. In the 2021 season, Lea led Vanderbilt to a 2–10 mark in his first season as head coach. The 2022 season marked improvement for Lea and the Commodores with a 5–7 record. The Commodores defeated SEC East rivals
Kentucky and
Florida to highlight the 2022 season. In the 2023 offseason, Lea's contract was extended three years through the 2029 season. Lea coached Vanderbilt to a 2–10 record in the 2023 season. On October 5, 2024, Lea coached Vanderbilt to a 40–35
upset victory over
No. 1 Alabama, the Commodores' first ever win vs an AP top 5 team, as well as their first win over Alabama since 1984. Lea led Vanderbilt to a 6–6 mark in the regular season. The team played in the
Birmingham Bowl against
Georgia Tech and won 35–27. Lea and Vanderbilt played the
University of Iowa in the
2025 ReliaQuest Bowl, losing to the Hawkeyes 34 to 27. Lea helped lead the Commodores to a 5–0 start, which included a 31–7 win over #11 South Carolina. The 5–0 start was Vanderbilt's first since the 2008 season. After a road 30–14 loss to #10 Alabama, Vanderbilt defeated #10 LSU 31–24 and #15 Missouri 17–10. With the win over Missouri, Vanderbilt had its best start since the 1941 season. Vanderbilt moved up to a #9 ranking in the AP Poll, its highest since 1937. Vanderbilt closed out the year with three consecutive wins: 45–38 over Auburn, 45–17 over Kentucky, and 45–24 over #18 Tennessee. On November 28, 2025, Lea agreed to a six-year contract extension with Vanderbilt, which included a significant salary increase. Vanderbilt finished with a 10–2 regular season in 2025. Vanderbilt finished with ten wins for the first time in school history. Vanderbilt lost the ReliaQuest Bowl to Iowa 34–27. Vanderbilt's three losses were the fewest for the program since the 1974 season. The 2025 season saw Vanderbilt ranked for the first time in the College Football Playoff rankings. Vanderbilt finished with a #15 in the final AP Poll, their highest finish since 1948. ==Head coaching record==