SEC names new top lawyer

Aronow, for instance, represented the chief financial officer for MF Global, the brokerage firm led by former Sen. Jon Corzine (D-N.J.) that collapsed in 2011. 

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In a statement, Walter said that Aronow would bring the "ideal combination of practical knowledge, expertise, and common sense" to the job.

"Geoff is a faithful steward of the securities laws with a comprehensive understanding of law enforcement who shares our commitment to excellence and passion for investor protection," Walter added.

Walter replaced Mary Schapiro, who stepped down as head of the SEC late last year. Aronow takes over for Mark Cahn, who departed last week.