At Aetna, a C.E.O.'s Management by Mantra

How Aetna's CEO Manages By Mantra
Mark Bertolini, chief executive officer of Aetna Inc., poses for a photograph following a Bloomberg Television interview on day three of the World Economic Forum (WEF) in Davos, Switzerland, on Friday, Jan. 23, 2015. World leaders, influential executives, bankers and policy makers attend the 45th annual meeting of the World Economic Forum in Davos from Jan. 21-24. Photographer: Simon Dawson/Bloomberg via Getty Images
Mark Bertolini, chief executive officer of Aetna Inc., poses for a photograph following a Bloomberg Television interview on day three of the World Economic Forum (WEF) in Davos, Switzerland, on Friday, Jan. 23, 2015. World leaders, influential executives, bankers and policy makers attend the 45th annual meeting of the World Economic Forum in Davos from Jan. 21-24. Photographer: Simon Dawson/Bloomberg via Getty Images

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.

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