HOME/ ABOUT/ ATTORNEYS/ PRACTICE AREAS/ SETTLEMENTS & VERDICTS/ NOTEWORTHY CASES/ IN THE NEWS Daniel P. O'Brien Daniel P. O'Brien Daniel P. O'Brien practice includes a broad range of expertise in litigation matters. He has successfully represented numerous clients in criminal, traffic and family court matters. Additionally, Daniel P. O'Brien has extensive experience in Real Estate, Landlord / Tenant, Matrimonial, Corporate and Estate Litigation. Daniel P. O'Brien has litigated cases in the boroughs of the City of New York, Nassau, Suffolk and in the Eastern and Southern Districts of the United States District Court. Daniel P. O'Brien is a member of the New York State Bar Association, Suffolk County Bar Association and the Suffolk County Criminal Bar Association. Daniel P. O'Brien is admitted to practice in the State of New York, the Commonwealth of Massachusetts and the United States Federal Courts, Eastern and Southern Districts of New York. Contact Us Name * First Name Last Name Email Address * Subject * Message * 168 Smithtown Blvd. Nesconset NY 11767 P: (631) 265-6660 Monday through Friday 8AM to 6PM Saturday 10AM to 2PM Disclosure: The materials on this website have been prepared by O'Brien & O'Brien Law for informational purposes only and are not legal advice. The photos and videos on this website contain portrayals of clients by non-clients, re-enactment of scenes, pictures and persons which are not actual or authentic and depictions which are a dramatization. The information is not intended to create, and any receipt thereof does not constitute, an attorney-client relationship, nor does your use of any part of this website create or constitute an attorney-client privilege. No person or organization should act upon any information on this site without first seeking professional legal counsel. O'Brien & O'Brien Law cannot and does not represent you until our client intake process is completed. Further, we reserve the right to accept or decline representing any person or organization in any matter. Please do not send us any confidential information, including via the contact form available on this site.