Slowik played college football at the University of Delaware, where he was a two-year starter at cornerback prior to beginning his coaching career there as a graduate assistant.

[1] Slowik was a defensive coordinator for the Denver Broncos, Green Bay Packers, Cleveland Browns and Chicago Bears in the National Football League (NFL) and for the Montreal Alouettes in the CFL.

It was announced that Slowik had joined the Calgary Stampeders as a defensive assistant on June 17, 2021.

He served in that capacity for three seasons before being promoted to defensive coordinator on December 16, 2024.

[5] Their son, Bobby Slowik, was the offensive coordinator for the Houston Texans of the National Football League (NFL) for 2 seasons.