His Badgers ranked in the top 20 nationally in total defense in each of his final four seasons there .
Bielema , a former Iowa defensive lineman , had a track record of coaching good defensive teams at Wisconsin .
Bielema 's Badgers ranked in the top 20 nationally in total defense in each of his final four seasons there .
Bielema , a former Iowa defensive lineman , had a track record of coaching good defensive teams at Wisconsin .