Jim Knowles' defense is not static and is certainly malleable to suggestions, but even a veteran coach has a breaking point with directives.  The coordinator reached his limit after three years at Ohio State,

Jim Knowles was introduced as Penn State's defensive coordinator on Tuesday. Here's what he said about leaving Ohio State football.

Former Ohio State defensive coordinator Jim Knowles said he was grateful for his three years at OSU, but the pull of his home state lured him away.