[1] He was best known for prosecuting mob figures, including fugitive Winter Hill Gang leader James "Whitey" Bulger and his partner, Stephen "The Rifleman" Flemmi.
In 2002, he was chair of a blue-ribbon commission appointed by the Acting Governor of Massachusetts, Jane M. Swift, to investigate allegations involving the Suffolk County Sheriff's Department.
[3] In 2008 he joined the firm of Cooley Godward Kronish LLP as a Partner in their Boston office.
He teaches a course called Government Lawyer at Harvard Law School.
In May 2013 he also joined Yurko, Salvesen & Remz, P.C., a boutique litigation law firm in Boston, as Of Counsel, where his practice focuses on internal investigations, white collar defense, and business litigation.