Giving Back Has Made This 41-Year-Old Retired Billionaire Less Popular

  • John Arnold, 41, of Houston at ease with data and controversy
  • Pension systems, bad science, drug-sentencing, organ donations
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When John Arnold was a trader, he had a serene -- some would say bloodless -- way of seeing the world. He wanted the truth, the cold, hard truth, and embraced the power of an idea no one else was seeing. Then he bet nearly everything he had on it.

In 2006, Arnold’s hedge fund, Centaurus Advisors, took a huge contrarian position on natural gas prices and made a fortune. In 2008, it anticipated the commodities crash.