Wall St whacks another powerful female By Svea Herbst-Bayliss

BOSTON (Reuters) – Lehman Brothers’ ousting of its female CFO, who had been the most powerful woman on Wall Street, exacerbated concerns about why so few women survive in the financial world’s executive suites.

Erin Callan, once considered a contender for Lehman’s CEO job, is neither the first nor the last …