Roger G. Ackerman And John W. Loose, Corning

Roger G. Ackerman has accomplished what executives at such companies as AT&T (T), Kodak (EK), and Xerox (XRX) haven't been able to: He has transformed a lagging giant of the Old Economy into one of the bright stars of the digital age. When Ackerman took over as CEO in 1996, Corning Inc. (GLW) was best known for its cookware. Now, as he steps down, it's the world's leading supplier of optical fiber and other high-tech parts. Put another way: Four years ago, Corning's market value was about $9 billion; today it's around $50 billion.

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