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James Simons
The Simons Foundation Autism Research Initiative aims to improve the diagnosis and treatment of autism disorders. The hedge fund billionaire, whose daughter is autistic, has committed more than $200 million to research.

This article is from the November 21, 2011 issue of Fortune.
Last updated November 10 2011: 1:28 PM ET
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Fortune contributor Brent Schlender shares some of the stories and personal photographs he collected during more than two decades as Steve Jobs' chronicler and confidant.