Business has its ups and downs, and so, naturally, do women in business. (Bye-bye, Martha!) But the story of this list is one of achievement: The credentials of these women, including the 13 newcomers, are the strongest yet. By Katie Benner, Eugenia Levenson, and Rupali Arora |  |  |  | 27 of 50 | 27. Heidi Miller 2006 rank: 25
Age: 54
Miller's division generates 14% of J.P. Morgan Chase's $61 billion in revenues. Operating profits rose 21% last year and are heading up this year too. In the first half of 2007, Miller increased assets under custody by 32%, to $15.2 trillion; she oversees operations in 39 countries. She reports directly to CEO Jamie Dimon, her longtime mentor.
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