Post-NFL
In 2002, Kozlowski became the head football coach of Wauconda High School in Wauconda, Illinois. While the team was winless over the course of his first two seasons, it eventually became a playoff qualifier. In 2009, Kozlowski accepted the head coaching job at North Chicago High School, which is in the same athletic conference as Wauconda. On September 4, 2009, a brawl erupted between North Chicago and visiting Chicago Simeon High School in the first quarter of the second game of the season, which resulted in a forfeit by North Chicago. An ensuing investigation of the fight by the Illinois High School Association resulted in an indefinite suspension of North Chicago's football team, which was soon lifted on September 15, 2009.
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