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Rosenblatt_Arnie

Arnold Rosenblatt

PartnerManchester

Arnie Rosenblatt is a Partner in Hinckley Allen’s Litigation group. With over forty years of experience as a trial lawyer, and one of the founding principals of his previous firm, Arnie successfully handles business disputes in state and federal courts, in regulatory settings and in arbitration. His extensive experience spans trying a wide range of jury and non-jury trials to verdict, dozens of preliminary injunction hearings, involvement in multiple mediations and arbitrations as well as serving as a mediator and arbitrator. His notable cases include successfully trying two of New Hampshire’s landmark trade secret cases, one on behalf of the prevailing plaintiff and one on behalf of the defendants, ultimately obtaining a defendant’s verdict.

In addition to his experience with trade secrets, Arnie covers a myriad of other business disputes such as intellectual property matters including trademarks, copyrights, and patents, non-competition agreements and matters related to employer-employee relationships, lender liability disputes, contract actions, corporate governance disputes, and professional malpractice matters. As a result of Arnie’s reputation as a trial lawyer, he is a Fellow of the American College of Trial Lawyers, where he previously served as Chair for the State of New Hampshire.

Based on his ability to resolve all types of business disputes, Arnie is a sought-out mediator. He also serves as an arbitrator and is a member of the American Arbitration Association’s Panel of Commercial Arbitrators for Large Complex Cases and its Employment Panel and is on the panel of the International Institute for Conflict Prevention and Resolution (CPR).

Arnie is active in the business and legal communities and is a frequent speaker at seminars concerning business and intellectual property litigation.

Work Experience

  • Hinckley Allen
    • Partner (2022-Present)
  • Cook, Little, Rosenblatt & Manson
    • Principal (1996-2022)
  • Wiggin & Nourie, P.A.
    • Partner (1987-1996)
  • Friedman & Wittenstein
    • Associate (1985-1986)
  • Debevoise & Plimpton
    • Associate (1981-1985)

Honors & Awards

  • Best Lawyers In America® (2006-2026)
    • Lawyer of the Year (2015-2019, 2021)
    • Bet-the-Company Litigation
    • Commercial Litigation
    • Litigation – Banking and Finance
    • Litigation – Intellectual Property
    • Litigation – Labor and Employment
    • Litigation – Patent
    • Litigation – Securities
  • Benchmark Litigation, Litigation Star (2023-2026)
  • Chambers and Partners, Chambers USA (2004-2026)
    • Litigation: General Commercial (2004-2026)
    • Intellectual Property (2019-2026)
  • Fellow of the American College of Trial Lawyers
  • Managing IP, IP Star, Trademark Stars (2022-2025)
    • New Hampshire and United States
  • Martindale.com: AV (5.0 out of 5.0) Peer Review Rated
  • Super Lawyers, New Hampshire (2007-2026)
    • Business Litigation
    • Top 5 New Hampshire Super Lawyers (2020-2024)
    • Top 100 New England Super Lawyers (2017, 2019)

Charitable & Civic Involvement

  • Town of Amherst, New Hampshire Planning Board, Chairman (2010-2026)

Professional Affiliations

  • American Bar Association
  • American Arbitration Association, Panel of Commercial Arbitrators
  • New Hampshire Bar Association

Bar Memberships

  • Massachusetts
  • New Hampshire
  • New York
  • Vermont
Firm News

Hinckley Allen Earns Strong Recognition in Chambers USA 2026 Guide

Hinckley Allen has once again earned prominent recognition in the Chambers USA 2026 Guide. This year, 10 practice areas and more than 30 attorneys across the firm’s offices in the Northeast and Florida earned distinguished rankings, underscoring Hinckley…

Firm News

Hinckley Allen Continues Momentum in the 2026 Edition of Benchmark Litigation

Hinckley Allen is proud to announce its continued growth and industry recognition, highlighted by expanded and new rankings in the 2026 edition of Benchmark Litigation. The publication reaffirmed the firm’s “Highly Recommended” ranking in Rhode Islan…

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Past Event

New Hampshire Bar Association: Intellectual Property for the General Practitioner

May 6, 2025

Daniel J. Bourque and Arnold Rosenblatt, partners in the Litigation and Intellectual Property Groups, will serve as featured speakers at the New Hampshire Bar Association's (NHBA) Intellectual Property Law Section's CLE program, "Intellectual Property for …

Past Event

Liability for Officers, Directors & Owners of Limited Liability Companies & Closely-Held Corporations

June 21, 2023

Partners Arnold Rosenblatt and Kathleen M. Mahan will be participating in an in-person CLE with simultaneous webcast hosted by the New Hampshire Bar Association addressing the legal exposure for individuals in a corporate and limited liability company sett…