By JEFF GOLDSMITH It has happened at least a dozen times. I mention John Arnold and am greeted by knowledgeable healthcare colleagues with a blank stare. Houston billionaire John Arnold is the most powerful man in US healthcare that nobody has ever heard of. An investing savant, Arnold made $50k in high school trading collectors’ hockey cards over the Internet. He became the star natural gas trader at Enron in his early twenties. Arnold, who played no role whatever in Enron’s storied collapse, left the company in 2001 with an $8 million bonus. In 2002, at age 28, Arnold founded a hedge...

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