“The Justice Department’s criminal division, which oversees some of the biggest investigations into Wall Street and corporate crime, is adding to its ranks.

“Marshall L. Miller, a longtime federal prosecutor in Brooklyn, was named to the criminal division’s No. 2 spot. As principal deputy and chief of staff to the criminal division’s leader, Mr. Miller will help oversee a broad caseload and about 600 prosecutors.

“His arrival coincides with a number of personnel changes in the division. After Mythili Raman left her role as the division’s leader last month, David O’Neil took over the spot on an interim basis.

“The changes have laid the groundwork for Leslie Caldwell, the White House’s choice to lead the criminal division, to eventually take over the operation. Ms. Caldwell, a former federal prosecutor turned defense lawyer, cleared the Senate Judiciary Committee but has yet to receive full Senate approval.”

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