Few software experts have had as revolutionary an influence on the development of computing as Charles Simonyi, and few have been so richly rewarded for their efforts. As a scientist at Xerox's Palo Alto Research Center in the 1970s, Simonyi invented Bravo, the first word-processing program that showed on-screen exactly how a document would look in print-a concept commonly referred to as "what you see is what you get." Simonyi then joined Microsoft, when it was still a startup with three dozen employees. There he became the company's chief architect, piloting the development of both Word and Excel. Along the way, he also became a billionaire: Forbes recently listed him as the 209th richest person in the United States.

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