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

John Dematteo III

Currently registered

John Dematteo III is an attorney admitted to the New York State Bar in 1993, with a registered practice address in New York, New York. According to the New York Office of Court Administration, the current registration status on record is Currently registered.

Registration number2510659
Bar statusCurrently registered
Year admitted1993
Judicial departmentDepartment 2
Law schoolHofstra University Maurice A. Deane School of Law
Practice cityNew York, NY
CountyNew York
Firm / organizationMorrison Mahoney, Llp
Office addressWall Street Plaza, 88 Pine Street, Suite 1900, New York, NY, 10005
Phone(212) 428-2497
Next registration dueJun 2027

About Morrison Mahoney LLP

Morrison Mahoney LLP is a law firm headquartered in Boston, Massachusetts, which says it has been practicing since 1948. Its website describes a trial-focused practice that defends insurance companies and their insureds, as well as professionals, healthcare providers and businesses, and it also offers business advising and transactional work for corporate clients. Listed practice groups include commercial and business litigation, construction litigation, employment and labor, environmental and toxic tort matters, insurance coverage, medical malpractice defense, product liability, transportation, and workers' compensation, plus appellate work and cybersecurity, privacy and data protection.

Practice areas of Morrison Mahoney LLP:

Appeals Commercial Litigation Construction Employment & Labor Environmental Health Care Insurance Medical Malpractice Personal Injury Privacy & Cybersecurity Workers' Compensation

These are the practice areas the organization describes on its website. They are not a statement about John Dematteo III’s own practice or any specialty certification.

View the Morrison Mahoney LLP profile and its 21 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.

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Bar status can change at any time. For the authoritative, real-time status of John Dematteo III, 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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Other graduates of Hofstra University Maurice A. Deane School of Law

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