Commentary: It's Getting Lonely At The Top. Too Lonely

Retirement just isn't what it used to be for some onetime stars of Corporate America. Just ask Henry Schacht, who successfully ran Lucent Technologies Inc. from 1995 to 1997. Or Paul A. Allaire, Xerox Corp.'s much-celebrated chief executive officer of the '90s. They've joined an exclusive--but recently fast-growing--club: CEOs who have been called back to duty after their successors were shown the door. The problem? There were no internal candidates ready to step into the top job.

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