Raymond A. Tierney was elected as the Suffolk County District Attorney on November 2, 2021, and assumed office on January 1, 2022. District Attorney Tierney is a career prosecutor, having served more than 27 years as a prosecutor at both the state and federal levels. District Attorney Tierney is an independent prosecutor committed to enforcing the law in an ethical and accountable manner to protect the citizens of Suffolk County.
District Attorney Tierney started his career in law enforcement as an Assistant District Attorney in the Suffolk County District Attorney’s Office in 1992 where he served under then-District Attorney James Catterson. He worked his way up through the ranks of the office from prosecuting misdemeanors, to presenting felony grand jury cases, and participating in all aspects of state felony prosecutions including trials of homicides, kidnappings, arsons, violent sexual assaults, and murder. Tierney then worked as District Court Trial Supervisor where he supervised entry-level ADAs.
After seven years at the Suffolk County District Attorney’s office, between 1999 and 2002, Tierney joined a local law firm where he managed cases for the litigation department of the firm, having primary responsibility for all aspects of discovery and trial including depositions, suit evaluations, meeting with clients and expert witnesses, legal research, motion drafting, preparing cases for trial, jury selection, and trying cases before juries in Bronx, Queens, Nassau, and Suffolk Counties.
In 2002, District Attorney Tierney returned to the Suffolk County District Attorney’s Office where he served as an ADA, investigating and prosecuting felony cases including political corruption, organized crime, street gangs, homicides, violent street crimes, domestic violence, child abuse, and child pornography. These prosecutions included long-term investigations overseeing the efforts of a designated team of detectives, utilizing wiretaps, search warrants, grand jury investigations, and trials.
Beginning in 2008, Tierney served as an Assistant U.S. Attorney in the Long Island Criminal Division of the U.S. Attorney’s Office for the Eastern District of New York, where he oversaw complex criminal investigations and prosecutions on behalf of the United States Government. District Attorney Tierney investigated allegations of criminal conduct, drafted and applied for search warrants and arrest warrants, presented evidence to federal grand juries, prepared and filed indictments, engaged in pretrial discovery, litigated pretrial matters by motion and pretrial hearings and conducted jury trials and sentencing hearings. District Attorney Tierney met and coordinated with the Department of Justice regarding long-term international criminal prosecutions, international fugitives, and death penalty protocols. He debriefed the Attorney General on the status of MS-13 prosecution nation-wide and in New York. District Attorney Tierney handled all phases of criminal prosecutions including drafting appellate briefs and arguing appeals before the Second Circuit Court of Appeals.
Between 2019 and 2021, Tierney served as Executive Assistant District Attorney in the Kings County District Attorney’s Office, working for DA Eric Gonzalez. Tierney was the Executive in charge of Violent Criminal Enterprises Bureau, Crime Strategies Unit, and Body Worn Camera Unit. He oversaw all aspects of bureau activities and was responsible for long-term violent street gang investigation and prosecutions. He worked with NYPD and federal partners on developing investigations to seize guns and best allocate resources to prosecute the many criminal street gangs causing most of the violence in Brooklyn. In this role, Tierney supervised units utilizing the efforts of designated teams of prosecutors, NYPD investigators, district attorney investigators, analysts, paralegals and clerical staff.
During his long career as a prosecutor, District Attorney Tierney received numerous awards including:
District Attorney Tierney attended Brown University where he was a member of the varsity football team, and he received his Bachelor of Arts in History and English in 1988. He received his Juris Doctor degree from St. John’s University School of Law in 1992. While attending St. John’s, Tierney was an Articles Editor at the St. John’s International Law Review from 1991-92.
District Attorney Tierney is a lifelong resident of Suffolk County where he resides with his wife, Erica, and their four children.
Suffolk County District Attorney's Office
William J. Lindsay County Complex - Bldg. 77
Veterans Memorial Highway
Hauppauge, NY 11788
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