The 25 Most Influential Executives of 2009

No one has more vision with a capital 'V' than Cisco's John Chambers. He has seen and then navigated the networking giant through every major twist and turn in this crazy business over nearly two decades. Now he's looking to take a bite out of HP's hide with what he calls the Unified Computing System (a networking device with an integrated blade server). That's not all. He aims to make Cisco a major player in the cloud with a full panoply of software, much of it garnered through acquisitions. And he's a big believer in the channel. How do you bet against a guy with a track record like this?

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