When it comes to charisma, Kenneth D. Lewis could never be confused with his boss and mentor Hugh L. McColl Jr.

Mr. Lewis, 47, plays understated cool to Mr. McColl's brashness and fire. But Mr. Lewis, the president and heir apparent at NationsBank Corp., does bring an enthusiasm to his job that is reminiscent of the 59-year-oM chairman, he just channels it in a different direction.

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