John W. Dennehy
DENNEHY LAW • Nashua, NH
Construction DevelopmentBusiness LitigationEmployment LawInsuranceManufacturing
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Contact
Email
Phone
Address
127 Main Street, Nashua, NH, 03060, US
Professional
About
John W. Dennehy is the Managing Partner at DENNEHY LAW, a distinguished boutique law firm located in Nashua, NH, specializing in providing top-tier litigation and counseling services to both businesses and individuals. With extensive experience across multiple states, including Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, New York, New Jersey, Maryland, Georgia, Louisiana, Wisconsin, Washington, and California, John has successfully navigated complex legal landscapes, culminating in favorable outcomes at trial, administrative hearings, and arbitration proceedings. John’s practice encompasses a diverse range of specialties, including Business Litigation, Design & Construction Law, Corporate Law, Insurance Law, and Employment Practices. He has effectively represented clients in intricate business disputes involving self-directed IRAs, hedge funds, copyright and trademark infringements, partnership disagreements, and trade secret matters. His extensive experience also includes advocating for professionals in the design and construction sectors—architects, engineers, surveyors, and real estate brokers—in litigation related to high-profile projects such as hospitals, universities, museums, and manufacturing facilities. In addition to his corporate work, John is committed to providing robust advocacy for individuals facing high-stakes personal injury issues, including wrongful death, traumatic brain injuries, and serious criminal defense cases. His comprehensive legal background is further enhanced by his prior experience as a Litigation Partner at Donovan Hatem LLP, counsel at Devine Millimet & Branch, and his roles within the insurance sector at Safeco Insurance Companies and Commerce Insurance Group. John is also a proud veteran of the U.S. Marines. John earned his Bachelor of Arts from UNC Wilmington and his Juris Doctor from Suffolk University Law School, equipping him with the knowledge and skills to deliver exceptional legal services to his clients. At DENNEHY LAW, he remains dedicated to achieving the best possible outcomes through personalized, client-centered representation.
About Construction Development Law
Construction attorneys handle legal matters in the building industry including contracts, disputes, liens, and regulatory compliance. Common matters include construction contracts, mechanic's liens, defect claims, delay disputes.
Credentials
Education
2003 Suffolk University Law School JD - Juris Doctor 1994 University of North Carolina Wilmington BA - Bachelor of Arts 1986 Pinkerton Academy Diploma
Languages
English
Recognition & Involvement
Awards
2002 CPCU, Commercial Concentration, American Institute of Chartered Property Casualty Underwriters 1997 Claims Production Award, Safeco Insurance Companies 1996 Associate in Claims, Insurance Institute of America
Publications
2009 Design & Construction Reporter republished by ASCE- Member Insurance Design Professionals Dismissed from Two New Hampshire Lawsuits 2009 Design & Constrcution Reporter Indiana Appeals Court Holds Economic Loss Doctrine Bars Negligence Claims Against Professionals 2008 The Design & Constrcution Reporter republished by SullivanKreiss Executive Search Blog Massachusetts Court RulesDesign Team is Not Responsible for Contractor's Failure to Perform Work 2006 American Bar Association's Manual on Product Liabililty Warnings American Bar Association's Manual on Product Liability- New Hampshire Section
Associations
2014 - Present Rockingham County Bar Association Member 2011 - Present Defense Research Institute Member 2010 - Present Boston Bar Association Member 2004 - Present New Hampshire Bar Association Member 2003 - Present Massachusetts Bar Association Member
Speaking
2010 ACEC-NH Contracts Seminar w/ David Hatem and John Dennehy of Donovan Hatem Risk Management Factors for Design Professionals
Updated: May 25, 2026