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Ajit Jain
The Jain Foundation seeks to cure muscular dystrophies caused by dysferlin protein deficiency. Jain, Warren Buffett's reinsurance chief at Berkshire Hathaway, has spent $7 million in hopes of curing the rare disease, which afflicts his 29-year-old son.

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.