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.
