The head of the FBI's Boston office has announced he's stepping down to take a private sector job.

Richard DesLauriers, who's been Special Agent in Charge of the office since July 2010, announced Tuesday he will step down next month after more than 26 years with the FBI.

DesLauriers, a native of Longmeadow, Mass., says he has accepted a position as vice president of corporate security with Penske Corp. in Bloomfield Hills, Mich.

During his tenure in Boston, he has played a role in the apprehension of fugitive James "Whitey" Bulger; the arrests of two Boston-area Russian "sleeper" agents; the arrest and terrorism convictions of Tarek Mehanna and Rezwan Ferdaus; the arrest and convictions of two major Mafia figures; and the investigation into the Boston Marathon bombings.