The Securities and Exchange Commission has announced that enforcement director Robert Khuzami will leave the agency.

The New York Times says his departure marks the end of “an important chapter in the history of the agency.” It adds that SEC was both praised for coming down on Wall Street’s largest banks after the financial crisis, but also scrutinized for not targeting top executives during his four-year stint.

Bloomberg reports he plans to step down as early as next month.

After being named enforcement director in February 2009 by former SEC chairman Mary Schapiro, Khuzami helped the division charge more than 150 individuals and entities. This included 65 CEOs, CFOs, and other senior corporate officers.

Read: Mary Schapiro leaving SEC

These largely financial crisis-related cases resulted in $2.68 billion in financial relief for harmed investors, as well as 36 individuals being barred from serving as officers and directors at public companies or from working in the securities industry.

Under Khuzami’s watch, the SEC also created a cooperation program that authorized the use of documents like non-prosecution agreements to establish incentives for people to fully cooperate with SEC investigations. The whistleblower program was authorized by the Dodd-Frank Act as well.

Read: SEC whistleblower awarded $50,000

Prior to joining the SEC, Khuzami served as a federal prosecutor with the U.S. Attorney’s Office for the Southern District of New York.