He spent most of his working life putting together a chain of movie theatres, but it was with the purchase of Viacom, a cable company, when he was 63, that his career took off.

ECONOMIST: Two sharks in a fishbowl

Health clubs are bulking up, and the brawniest of them is Life Time Fitness (53, LTM), a chain of 60 fitness centers usually attached to suburban office parks.

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The chain sprung to life in August 2005 after the sale of its Canadian unit took about a billion dollars of debt off its books and swept Canada head EricClausEric Claus into the chief executive role.

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Greenpeace asks companies to measure and reduce their greenhouse gas emissions throughout the life cycle of their products: supply chain, manufacturing, distribution, customer use, and end-of-life, using a combination of energy efficiency, renewable energy, and energy policy advocacy.

FORBES: How Green Are Your Gadgets?