George Canellos, co-head of the U.S. Securities and Exchange Commission’s (SEC) enforcement division, is leaving the regulator.

The SEC said Friday that the other co-head of the enforcement division, Andrew Ceresney, will continue to serve as director of the division. Canellos, who will leave the regulator later this month, has yet to make future career plans, it says.

Canellos joined the SEC in 2009 as director of the New York regional office, and served as deputy director and co-director of the enforcement division in 2012 and 2013. Prior to joining the SEC, he spent six-and-a-half years as a litigation partner at Milbank Tweed Hadley & McCloy. He was also a federal prosecutor with the U.S. attorney’s office for the Southern District of New York for nine years.

SEC chair, Mary Jo White, noted that Canellos “helped to improve coordination between the enforcement and exam programs, streamline procedures to expedite investigations, and better integrate our investigative and trial functions.

The SEC notes that he also led efforts to recruit industry experts and academics, including specialists in structured products, derivatives, and applied mathematics.