The U.S. Attorney's Office for the Southern District of New York, the main federal prosecutor overseeing Wall Street, has named Katherine Goldstein as Chief of that office's Securities and Commodities Fraud Task Force, Reuters reports.

Goldstein, who was named Deputy Chief of that task force in May 2014, fills the position left vacant last month when the SDNY's Anjan Sahni joined law firm WilmerHale. Goldstein joined the SDNY in 2004 and previously served as Chief of the SDNY's general crimes unit. Among her notable cases is the prosecution and conviction of WorldCom founder Bernard Ebbers for accounting fraud, the WSJ reported last year.

Reuters reports that Telemachus Kasulis has been named as the new Deputy Chief. Kasulis, an Assistant U.S. Attorney in the SDNY, recently completed a successful insider trading prosecution of David Riley, the former Chief Information Officer of Foundry Networks. Riley was convicted for conspiracy to commit securities fraud in October 2014, and this week prosecutors asked the court to sentence Riley to more than five years in prison.