A Banker, an Intern and a Reckoning for Wall Street Bro Culture

This story might surprise old-school Wall Streeters.

On July 10, after weeks of rumbling inside Credit Suisse, Paul Dexter, a senior banker, was let go over a complaint of inappropriate behavior involving an intern. Rumors swirled in M&A circles.

Only this wasn’t a case of sexual harassment, people familiar with the matter said. Rather, unruly workplace behavior—which, not long ago, might have been grudgingly tolerated by management at many firms—had finally caught up with Dexter.

The dismissal of a single banker at a single bank might seem inconsequential in this #MeToo era. Yet Dexter’s rise and fall encapsulates the new ...