The U.S. Securities and Exchange Commission (SEC) has named two new heads for its largest division, enforcement.

The SEC announced today that its acting director of enforcement, George Canellos, will jointly head the department with former federal prosecutor, Andrew Ceresney. Canellos, 48, has been serving as director of the division since January, when its previous head, Robert Khuzami, left the agency.

Canellos had been the division’s deputy director since June 2012. Before that, he was director of the SEC’s New York regional office. He also spent nine years as a federal prosecutor, and six years in private practice.

Ceresney, 41, served as a deputy chief appellate attorney in the U.S. Attorney’s Office for the Southern District of New York, where he was a member of the Securities and Commodities Fraud Task Force and the Major Crimes Unit. He was also a partner in the law firm of Debevoise & Plimpton LLP, where he focused on representing entities and individuals in white collar criminal and SEC investigations, complex civil litigation and internal corporate investigations.

The enforcement division is the largest at the SEC, with more than 1,200 investigators, accountants, attorneys and other professionals.

New head of the SEC, Mary Jo White, said, “George and Andrew are two of the best lawyers and finest people I know. They are a perfect combination to lead the talented enforcement division professionals who protect investors and keep our markets safe and vibrant.”