Spent the 2011 season as Indiana's defensive ends coach and recruiting coordinator.
Served as the defensive line and special teams intern at the University of Nebraska from 2008-10. He also assisted with the strength and conditioning program.
Nebraska enjoyed three straight bowl appearances during his tenure, including victories in the 2009 Gator Bowl and the 2009 Holiday Bowl.
NU's 2010 defense ranked in the top 10 nationally in pass efficiency (third), passing (fifth) and scoring (ninth), and sat 11th in total defense.
Defensive end Pierre Allen earned first team All-Big 12 honors. The Cornhuskers won the Big 12 North Division, finished 10-4 overall and played in the Holiday Bowl.
In 2009, the Cornhuskers led the nation in scoring, pass efficiency and red zone defense, while also ranking in the top 10 nationally in sacks, rushing and total defense.
They surrendered just 10.4 points per game, posted two shutouts and allowed only two opponents to reach 20 points. Nebraska led the nation by holding eight opponents to 10 or fewer points, including seven in single digits.
Defensive tackle Ndamukong Suh was the second overall pick in the 2010 NFL Draft after being named a Heisman Trophy finalist and the winner of the Associated Press National Player of the Year, Bronko Nagurski Trophy, Rotary Lombardi Award, Outland Trophy and the Chuck Bednarik Award.
Coached the defensive line at Minnesota State University-Mankato in 2007. He was the defensive coordinator, defensive line coach and defensive backs coach at the University of Wisconsin-Stout from 2004-06. Diersen also served as the program's recruiting coordinator and assistant strength and conditioning coach.
From 2001-03, Diersen oversaw the defensive line, outside linebackers and was the special teams coordinator at the University of Dubuque.
He got his start in coaching at Wisconsin-Stout as an offensive and defensive graduate assistant from 1998-00. The program advanced to the NCAA Division III postseason in his final year.
Enjoyed a successful playing career (1994-98) at Huron (S.D.) University. He was a three-year all-conference defensive end and a four-year Dean's List student.
Diersen earned his bachelor's degree from Huron in 1998 and a master's degree in education from Wisconsin-Stout in 2005.
Brett is engaged to Jenna Brown.
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