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Initiatives as District Attorney

Upon taking office in 2022, District Attorney Tierney immediately formed the first Violent Criminal Enterprises Bureau to combat organized crime and gang violence in Suffolk County, and re-established the office’s Homicide Bureau as a distinct bureau. Additionally, during his first year in office, District Attorney Tierney formed two specialized prosecution units: the Biological, Environmental, and […]

Awards and Accolades

During his long career as a prosecutor, DA Tierney has received numerous awards including: • Federal Law Enforcement Association’s “Prosecutor of the Year” for the successful prosecution of over twenty MS-13 members in United States v. Alvarenga, et al., November 2016. • FBI Long Island Gang Task Force “Meritorious Service Award” for successful prosecution and […]

Federal Prosecutor

Beginning in 2008, District Attorney Tierney joined the United States Attorney’s Office and served as an Assistant United States Attorney in the Long Island Criminal Division for the Eastern District of New York. There, District Attorney Tierney oversaw complex criminal investigations and prosecutions on behalf of the United States Federal Government. In this role, District […]

Early Career

In 1992, District Attorney Tierney began his career as an Assistant District Attorney at the Suffolk County District Attorney’s Office, where he served under then-District Attorney James Catterson. He worked his way up through the ranks of the office, and handled serious felony prosecutions including kidnapping, arson, violent sexual assault, and murder. District Attorney Tierney […]

Education

District Attorney Tierney attended Brown University, where he was a member of the varsity football team and received his Bachelor of Arts in History and English in 1988. In 1992, District Attorney Tierney received his Juris Doctor degree from St. John’s University School of Law. While attending St. John’s, he was an Articles Editor at […]