Occupation: Chairman and CEO, Mondelēz International
Poor Irene. In January, she gritted her teeth and made activist investor Nelson Peltz a member of her board; in return, he agreed to lay off his calls for a merger with PepsiCo. But Peltz, who successfully lobbied for the Kraft split that created Mondelēz in 2012, has been critical of both Rosenfeld and the Mondelēz name. “It sounds like a disease,” he has said. The year 2014 will test whether she can hold on to her job.