CEO, Symantec (SYMC)
Age: 58
Thanks to the $13.5 billion acquisition of Veritas three years ago, Symantec now dominates the business of software that stores and secures data. Now, through a joint venture Thompson struck with Chinese telecom-gear maker Huawei, it's getting into the hardware business, posing a threat to EMC and other storage-hardware companies. Age: 58
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