• Joined Clemson as a defensive analyst and assistant linebackers coach in 2025 and was promoted to the team’s defensive pass game coordinator role in 2026.
• Assumed a larger role with Clemson’s defensive backfield in the final stretch in 2025 and was formally named as the team’s defensive pass game coordinator in January 2026.
• Said Head Coach Dabo Swinney of Allen’s “I didn’t really know Thomas other than he was Tom’s son coming in here, but let me tell you this, he will be a coordinator in the SEC, Big Ten, ACC or Big 12 before he’s 30. He is a really, really gifted young coach... He will work with the back five and handle out installs and make sure everybody is on the same page. He did a really great job when we empowered him this way as the [2025] season wore on.”
• Arrived at Clemson after serving one season as a defensive analyst at Penn State in 2024, a year in which the Nittany Lions recorded a school-record 13 wins and a College Football Playoff berth.
• That Penn State defense recorded two pick-sixes in its win against SMU in the CFP First Round, and it bottled up Heisman runner-up Ashton Jeanty to a season-low 3.47 yards per carry and no touchdowns in a victory over Boise State in the CFP National Quarterfinal at the Fiesta Bowl.
• Penn State finished seventh in the nation in total defense (294.8 yards per game) and eighth in the nation in scoring defense (16.5 points per game) with both Allens on staff.
• Spent two seasons as a defensive graduate assistant at Indiana from 2022-23, assisting primarily with the team’s nickelbacks.
• Part of a 2023 Indiana staff that helped linebacker Aaron Casey to second-team All-America honors. Casey posted 109 tackles, including a Big Ten-best 20 tackles for loss (third-most nationally).
• Played linebacker at Indiana from 2017-21. After redshirting the 2017 season, he compiled 56 tackles, 3.5 tackles for loss, one sack, one interception and one forced fumble in 32 career games for the Hoosiers.
• Was a four-time Academic All-Big Ten selection who graduated from Indiana with a degree in management in 2021 and secured his MBA from Indiana in 2022.
• Son of Clemson Defensive Coordinator Tom Allen.
• Married to his wife, Annika, who was a standout softball player at Indiana from 2018-21.