Official NY OCA attorney registration data · Updated 2026 Methodology Discipline records

Shannon Duignan O'Brien

Currently registered

Shannon Duignan O'Brien is an attorney admitted to the New York State Bar in 2022, with a registered practice address in Garden City South, New York. According to the New York Office of Court Administration, the current registration status on record is Currently registered.

Registration number5951595
Bar statusCurrently registered
Year admitted2022
Judicial departmentDepartment 2
Law schoolSt. Johns University School of Law
Practice cityGarden City South, NY
CountyNassau
Firm / organizationMahon, Mahon, Kerins & O'Brien, Llc
Office address254 Nassau Blvd, Garden City South, NY, 11530
Phone(516) 601-0714
Next registration dueNov 2026

About Mahon, Mahon, Kerins & O'Brien, LLC

Mahon, Mahon, Kerins & O'Brien, LLC is a law firm based in Garden City South, New York, whose official website centers on estate and trust work. The site says the firm has a long history of guiding clients through the duties of administering an estate or trust. It also includes a page on counsel work for the Nassau County Public Administrator, a public fiduciary office, and describes the firm's involvement in cases where the Public Administrator serves as fiduciary.

Practice areas of Mahon, Mahon, Kerins & O'Brien, LLC:

Trusts & Estates Elder Law Personal Injury Employment & Labor Commercial Litigation Real Estate

These are the practice areas the organization describes on its website. They are not a statement about Shannon Duignan O'Brien’s own practice or any specialty certification.

View the Mahon, Mahon, Kerins & O'Brien, LLC profile and its 7 registered attorneys →

Office location

Registered office address on file with the New York State Bar. Verify before visiting, as the address reflects the contact on record and may be a firm rather than a personal office.

Verify this record

Bar status can change at any time. For the authoritative, real-time status of Shannon Duignan O'Brien, confirm directly through the official New York Attorney Search using the registration number above. This record is republished from public New York State data and is provided for reference only — it is not legal advice and not an endorsement.

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