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30. Mary Callahan Erdoes
CEO, Asset Management
J.P. Morgan Chase (JPM)
Previous rank: New
Age: 43

When mentor Jes Staley stepped up to run J.P. Morgan's investment bank last fall, this rising star took his spot running the $8 billion business, with $1.6 trillion in assets under supervision.

NEXT: Joanne Maguire
Last updated September 30 2010: 2:47 PM ET
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