A member of the Massachusetts and Florida state bars and the federal bar in Massachusetts, Mr. O’Brien has also represented clients on criminal state and federal matters in more than twenty states.

Mr. O’Brien’s practice concentrates on all areas of criminal defense, including white collar, crimes of violence, fraud, narcotics, motor vehicle offenses and operating under the influence. He has extensive experience in issues relating to search and seizure as well as issues arising in the defense of operating under the influence.

Having successfully handled hundreds of cases of individuals charged with operating under the influence and other motor vehicle offenses, Mr. O’Brien also has considerable experience with related issues involving license suspensions and requests for license reinstatement. He frequently represents clients before the Registry of Motor Vehicles and Board of Appeal for the Registry.

Mr. O’Brien also has extensive state appellate experience, having argued before the Supreme Judicial Court and Appeals Court of Massachusetts as well as the Supreme Court of New Hampshire. On the federal level he is admitted to practice before the First, Second, Fourth and Seventh Circuit Courts of Appeal.