In late January the three billionaires announced they were teaming up to form a company, free from “profit-making incentives,” that would seek to lower the cost of covering their hundreds of thousands of employees. He had won Buffett’s confidence at Berkshire, where he sparked the company’s largest acquisition, and he’d impressed Dimon so much when the banker visited Omaha that he was invited to join the board of JPMorgan Chase & Co.

Combs, 47, a former hedge fund manager who has no experience in the health-care industry and likes to keep a low profile, was both an odd and an obvious choice as the CEOs’ emissary. chief executive officer on board as well. But one day last year he found himself on a flight to Seattle with an unusual mission: Pitch Jeff Bezos on a bold idea for wringing costs out of the US health-care system.Two of the biggest corporate chieftains in America-his boss, Warren Buffett, and Jamie Dimon, who runs the largest bank in the country-had already signed on. Todd Combs spends most of his days reading in a quiet office in Omaha, where he’s an investment manager at Berkshire Hathaway Inc.

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