Divvying up chief executive responsibilities has had mixed results
Company: California Pizza Kitchen
CEOs: Rick Rosenfield and Larry Flax
Skinny: Together they founded the high-end pizza chain in 1985 and still run it today.
Company: Kraft Foods
CEOs: Betsy Holden and Roger Deromedi
Skinny: They shared the top job from 2001 to 2003. Then Holden was demoted amid sagging sales and left.
CEOs: Sandy Weill and John Reed
Skinny: They had a tense relationship after the 1998 merger of Citicorp and Travelers. In 2000, Reed left.