Ohio State is a self-sustaining program that doesn't live or die by one coordinator. That's harder than it looks.

As Ohio State faces Penn State at Ohio Stadium on Saturday, here's a look back at why Jim Knowles left the Buckeyes this ...

Former Ohio State defensive coordinator Jim Knowles abruptly ended his time with the Buckeyes to join Penn State Jan. 26, ...

Ohio State football spent the first half of its season experimenting on offense. Against Penn State, we saw the payoff of the ...

Are the former Buckeyes co-workers interacting with one another? Especially before Ohio State takes on Penn State?

Jim Knowles left Ohio State football for Penn State in January. Here's what coach Ryan Day said about the "abrupt" departure.

Ryan Day and Jim Knowles have a long history together, but for Day, him seeing Jim Knowles at Penn State doesn't bother him.

Ohio State's game against Penn State marks the return of former defensive coordinator Jim Knowles, now in the same position ...

Ohio State-Penn State is not the marquee matchup many expected. Will Knowles and the Nittany Lions have any surprises in ...

Dust off the ‘D’ word. Give it a shine. We’re nearly ready to use it again. This time, for Ohio State. Dynasty.

Ryan Day said “there really hasn’t been much communication” with Jim Knowles since Knowles left for Penn State, but “we ...

CBS Sports is a registered trademark of CBS Broadcasting Inc. Commissioner.com is a registered trademark of CBS Interactive Inc.