Image: Groupon founder and CEO Mason attends the second day of the Allen and Company Sun Valley Conference in Sun Valley, Idaho
Anthony Bolante / Reuters

CNBC   |  December 18, 2012

Are these guys the 3 worst CEOs of 2012?

CNBC's Herb Greenberg breaks down the bottom 3 on his "Worst CEOs of 2012" list, which includes Microsoft's Steve Ballmer, JC Penney's Ron Johnson and Groupon's Andrew Mason. Ken Langone, Invemed Associates, challenges Herb's methodology.

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