He 's silenced his critics by leading his program to match its best start in school history .
A 7 - 6 record in 2014 left some fans wondering if the Kirk Ferentz era at Iowa was over .
Kirk Ferentz 's silenced Kirk Ferentz 's critics by leading his program to match its best start in school history .
A 7 - 6 record in 2014 left some fans wondering if the Kirk Ferentz era at Iowa was over .