Robert Khuzami last week became the latest top official to announce his departure from the U.S. Securities and Exchange Commission. As head of the Enforcement Division, Khuzami brought a record number of new cases and undertook a top-to-bottom overhaul of how the SEC detects and prosecutes wrongdoing.

Among the changes to the 1,100-­person division on his watch: creating five new specialized units, coming up with standards for rewarding individual cooperation and establishing the Office of Market Intelligence to handle tips. He took his lumps as well, criticized for not going after more Wall Street executives and for settling some cases on the cheap.