Regulatory chiefs are often market experts or academics. But Ms. White spent nearly a decade as United States attorney in New York, the first woman named to this post. Among her prominent cases, she oversaw the prosecution of the mafia boss John Gotti as well as the people responsible for the 1993 World Trade Center bombing. She is now working the other side, defending Wall Street firms and executives as a partner at Debevoise & Plimpton.

Yeah, girl.