On a recent wintry afternoon, Mark T. Bertolini, the 58-year-old chief executive of Aetna, 
the health insurer, was sitting in his Hartford office wearing a dark suit and a crisp, white, French-cuffed shirt. But instead of a necktie, he wore a shiny metal amulet engraved with the Sanskrit characters “sohum.”
Roughly translated, sohum means “I am that,” and repeating the phrase is used to help control breathing in meditation. Mr. Bertolini says the word also signifies a divine connection with the universe. (He has a similar design tattooed on his back.)
In case there was any doubt, Mr. Bertolini, who runs one of America’s 100 largest companies by revenue, wants to make it clear he is a different sort of C.E.O.
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