Shakeup at JC Penney good for Company?

Jeffrey Sonnenfeld, Yale professor, explains why he thinks Bill Ackman's resignation is good news, and Andy Serwer, Fortune managing editor, and John Taylor, FX Concepts, explain the difficulties involved in "righting the ship" at the giant retailer.  Watch CNBC Video.

Jeffrey A. Sonnenfeld

Senior Associate Dean for Leadership Studies & Lester Crown Professor in the Practice of Management