Erik Sirri, the director of the Securities and Exchange Commission's division of trading and markets, will leave at the end of the month to return to academia, the SEC announced yesterday.

Sirri was hired by former SEC chairman Christopher Cox in 2006 to succeed Annette Nazareth, who was tapped to become a commissioner. Sirri has presided over the agency's regulation of securities exchanges, brokers, dealers, clearing agencies, transfer agents and credit rating agencies.

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