CEO, Qualcomm (QCOM)
Age: 44
Skeptics didn't think Paul Jacobs could fill the shoes of his father, Qualcomm's founder and longtime CEO, when he took the top job in 2005. But under the younger Jacobs, the tech giant has thrived as it morphs from the Wintel of the wireless world -- it owns rights to a vast swath of intellectual property behind high-speed 3G networks -- into the Comcast of mobile media. His most recent venture is an $800 million gambit to bring live television to cell phones. Age: 44
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