Why President Obama has Wall Street worried

This week, President Obama nominated Mary Jo White, the former U.S. attorney for the Southern District of New York, to head the Securities and Exchange Commission, an agency whose reputation as a watchdog was badly battered in the wake of the financial crisis and the Bernie Madoff Ponzi scheme. Obama signaled that White's appointment would mark a new era of reinvigorated government oversight of the financial industry. "You don't want to mess with Mary Jo," Obama said. "As one former SEC chairman said, Mary Jo 'does not intimidate easily.'"

The response to White's appointment has been largely positive among those who would prefer to see stricter regulation of Wall Street. She has developed a reputation as a tough prosecutor — in fact, she would become the first prosecutor ever to lead the SEC. According to Dylan Matthews at The Washington Post:

She also has a fairly solid record prosecuting white-collar crimes, such as a "pump and dump" financial scheme in the 1990s that involved members of the Mafia. However, some critics have taken issue with other parts of White's resume, particularly the years she spent at the blue-chip law firm Debevoise and Plimpton, where she defended corporate clients like former Bank of America CEO Kenneth Lewis and Morgan Stanley CEO John Mack. For some, the mere fact that she has worked on both sides is a count against her. According to David Sirota at Salon:

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Others argue that the head of the SEC should have experience in both government and Wall Street, particularly after a crisis that showed just how clueless officials were about exotic financial instruments and the like. "Sure, the revolving door can lead to regulatory capture," says Massimo Calabresi at TIME. "But the mismatch between private industry and government in skills, knowledge and capacity is much more likely to produce that problem. Hiring someone who has seen the ugliest of the big banks is a smart choice."

It's important to remember, too, that White's responsibilities would be broader than merely punishing wrongdoing. As Michael Bobelian at Forbes explains:

The hope, then, is that White will not only prosecute crimes, but take actions to prevent them. "It's absolutely the case that better-informed and more active regulators, particularly when they have the resources and the presidential support they need, can limit and mitigate bad behavior," says James Surowiecki at The New Yorker, "rather than simply punishing it after the fact.