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John O'Neill

John G. O'Neill


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John O'Neill
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John focuses his practice on business litigation and on insurance-coverage and professional-liability matters. He counsels and represents businesses and business owners in a range of high-stakes commercial disputes, including shareholder disputes and claims of breach of fiduciary duty, breach of contract, commercial fraud, and violation of consumer-protection statutes.

John has deep experience in complex insurance-coverage disputes. He regularly advises clients throughout the United States in matters involving insurance for professional liability, director-and-officer liability, pollution liability, general liability, and property. He represents insurers in coverage litigation and in suits involving claims of bad faith and extra-contractual liability.

In the professional-liability area, John represents accountants, engineers, architects, attorneys, real estate brokers, and other professionals in the defense of malpractice claims and disciplinary proceedings. Complementing his experience in this field, John has served as a disciplinary-hearing officer for the Massachusetts Board of Bar Overseers.

John’s clients benefit from his pragmatic, goal-oriented approach to resolving disputes, and his experience in presenting creative, well-reasoned arguments to courts and juries.

More about John

Professional Affiliations
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  • Boston Bar Association
  • Massachusetts Bar Association
  • Professional Liability Underwriting Society
  • Hearing Officer, Board of Bar Overseers, 2012-2014
Writing & Speaking
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  • Author, “Can Damaging Internal Emails be Kept From the Jury,” New England In-House, August 2016
  • Presenter, “Engineers’ Professional Liability Insurance,” Half Moon Seminars, February 2015
  • Panelist, “Common Coverage Issues – Or Everything You Need to Know About Insurance Before Being Sued,” Boston Bar Association, May 2015
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  • Massachusetts Super Lawyers (Business Litigation), Boston magazine, 2009-2016