He was selected by Green Bay Packers in the fifth round of the 2002 NFL draft, and also played for the Jacksonville Jaguars.

[citation needed] In football, Kampman led Aplington–Parkersburg to three straight playoff appearances and a runner-up finish in the state championship as a junior.

Kampman played the linebacker position and set school records for tackles in a game (26), a season (188), and a career (447).

After the season, Coach Fry retired, and Kampman played the rest of his career for Kirk Ferentz.

Kampman responded with possibly the best game of his college career, making 15 tackles and three sacks and leading Iowa to a 42–24 victory.

Kampman was selected with the 21st pick in the fifth round of the 2002 NFL draft by the Green Bay Packers.

Kampman had become a steady defender who anchored the left side of the Packers' line most of the prior two years.

[6] In earning this award he joined Reggie White (1998) as the only Packers to win defensive honors twice in the same season.

His achievements helped him earn a bid to the 2007 Pro Bowl as well as being named second-team All-Pro by the Associated Press.

On November 1, 2007, Kampman was named the NFC Defensive Player of the Month for October, having recorded 5.5 sacks during that time period.

[7] Kampman attended the 2008 Pro Bowl, along with teammates Chad Clifton, Donald Driver, and Al Harris, as well as head coach Mike McCarthy.

[8] On December 7, 2009, Kampman was officially placed on injured reserve due to a knee injury he suffered earlier in the year versus the San Francisco 49ers in week 11.