The turning point for Stephan Jung came in February, around the time bonus checks were slashed. A veteran of UBS, one of many banks tarnished by the financial crisis, Mr. Jung realized that the old Wall Street would not be bouncing back any time soon. It was time to head for the new. “After 10 years, I did not see a future for myself,” said Mr. Jung, 42, who quit to parlay his sales expertise into
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