He started his career with Venturini Motorsports in the ARCA Racing Series where he spent two years working as car chief on the No.

18 Toyota Camry Team won the NASCAR Cup Series Championship with crew chief Adam Stevens and driver Kyle Busch.

Allen is a graduate of the University of Washington where he achieved a bachelor's degree in Mechanical Engineering and was part of the UW Formula SAE team for 4 years.

[1][2] From a young age Allen was raised around the small tracks of the Pacific Northwest as his father Terry and two uncles Mike and John raced 1/2 sized stock cars.

[5] In 2010 Allen finished his racing in the Pacific Northwest competing at Evergreen Speedway in the NASCAR Whelen All-American Series.

Allen led chassis setup plate, pull down rig analysis and simulation, including wind tunnel aerodynamic testing.

Matt Lucas took over as Crew Chief for James Buescher replacing Chris Rice who moved to NASCAR Camping World Truck Series.

[14] In 2016 Allen moved to the Joe Gibbs #18 team again with driver Kyle Busch where they won 9 poles, 10 wins and lead over 2,000 laps.

[15] NASCAR drivers that also drove the #54 and #18 in 2015 and 2016 included Boris Said, Bobby Labonte, Denny Hamlin, David Ragan, Owen Kelly, Drew Herring, and Matt Tift.

[16] On October 16, 2024, JGR announced that Allen would be the crew chief for Taylor Gray in his rookie season in the Xfinity Series in 2025 in the No.