One in every five PCs sold today is made by Hewlett-Packard, and that's largely thanks to Todd Bradley.

He was CEO Mark Hurd's first major hire when Hurd took the reins from Carly Fiorina in 2005.

Within a year, Bradley, 49, launched the celebrity-packed "The computer is personal again" ad campaign, recruited designers like Vivienne Tam, and outsold Dell to become the largest PC maker.

Under his leadership, HP's $42 billion personal systems group, which also includes mobile devices, workstations, and Internet services, has increased profitability by 300%.

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