7. Irene B. Rosenfeld
7. Irene B. Rosenfeld
Chairman and CEO, Kraft Foods

Just 18 months after Rosenfeld led Kraft's $19 billion acquisition of Cadbury PLC, Kraft effectively undid the merger by announcing that it was splitting itself into two separate public companies: North American grocery and global snacks (she hasn't decided which one to run). For now, the combined firm is the world's biggest confectionery player ahead of Mars/Wrigley. Major risks include commodity cost inflation, which has been a serious issue for all food companies in recent years and is not expected to go away.


By Richard McGill Murphy, contributor - Last updated November 17 2011: 5:58 PM ET