Best Lawyers in Massachusetts, United States for Intellectual Property Law
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Mark Matuschak is an experienced trial lawyer focusing on trademark, trade dress, patent and trade secret litigation. He is often brought in shortly before trial as lead counsel to craft winning strategies in difficult-to-win cases and jurisdictions and on appeals. Mr. Matuschak has tried dozens of cases, obtained the first-ever jury verdict of patent invalidity in the Eastern District of Texas, won a number of notable trademark and trade dress cases in the financial services, consumer produc...
John J. Penny V is a top attorney recognized by Best Lawyers in the practice area(s) of Patent Law. John J., who practices law in Boston, Massachusetts, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which John J. is held by other top lawyers in the same geographic and legal practice area.
Rory Pheiffer works with clients to develop patent portfolios, domestically and abroad, that align with their business goals. He also counsels clients on patent opinion and product clearance matters, IP due diligence issues on the buyer and seller side, license negotiations, and trademark portfolio growth and enforcement in conjunction with building the client’s brand. Clients rely on Rory’s technical knowledge, which he honed while earning a degree in mechanical engineering from ...
Melissa Hunter-Ensor is a top attorney recognized by Best Lawyers in the practice area(s) of Patent Law. Melissa, who practices law in Boston, Massachusetts, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Melissa is held by other top lawyers in the same geographic and legal practice area.
Tim’s extensive experience includes patent office litigation matters such as patent interference proceedings, Inter Partes Review and reexamination proceedings. He has shaped and executed winning strategies in patent litigations. In helping clients achieve their business goals, Tim devises strategies for maximizing the value of patent portfolios for litigation, licensing or acquisition. He develops and implements strategies for protecting his clients’ key technologies and for avoi...
Ms. Whelan's practice includes Patent Office practice, litigation, and counseling in the field of life sciences, including chemistry, biotechnology and pharmaceuticals. Her experience includes patent strategy across the spectrum from pre-litigation investigation and litigation, to Patent Office post-grant proceedings including inter partes review and reexamination, to analysis of the competitive landscape and IP due diligence, as well as obtaining patent protection and portfolio management.
Michael T. Siekman is a top attorney recognized by Best Lawyers in the practice area(s) of Patent Law. Michael T., who practices law in Boston, Massachusetts, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Michael T. is held by other top lawyers in the same geographic and legal practice area.
Amy DeCloux Ph. Dr. is a top attorney recognized by Best Lawyers in the practice area(s) of Patent Law. Amy, who practices law in Boston, Massachusetts, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Amy is held by other top lawyers in the same geographic and legal practice area.
Douglas J. Kline is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Intellectual Property, Litigation - Patent and Patent Law. Douglas J., who practices law in Boston, Massachusetts, has been recognized since 2012. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Douglas J. is held by other top lawyers in the same geographic and legal practice area.
Cheryl A. Clarkin is a top attorney recognized by Best Lawyers in the practice area(s) of Trademark Law. Cheryl A., who practices law in Boston, Massachusetts, has been recognized since 2019. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Cheryl A. is held by other top lawyers in the same geographic and legal practice area.
David Resnick is the team leader of the Patent group and he works with startup and established companies, as well as major U.S. research institutions, to develop comprehensive patent strategies to protect their intellectual property. What do you focus on? My practice is focused on strategic portfolio management, patent prosecution, transactional matters and associated client counseling. I manage the patent portfolios of some of the leading U.S. research institutions and domestic and internati...
Michael J. Attisha Ph.D. is a top attorney recognized by Best Lawyers in the practice area(s) of Patent Law. Michael J., who practices law in Boston, Massachusetts, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Michael J. is held by other top lawyers in the same geographic and legal practice area.
David J. Dykeman is a top attorney recognized by Best Lawyers in the practice area(s) of Patent Law. David J., who practices law in Boston, Massachusetts, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which David J. is held by other top lawyers in the same geographic and legal practice area.
Charles Larsen is a top attorney recognized by Best Lawyers in the practice area(s) of Patent Law. Charles, who practices law in Boston, Massachusetts, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Charles is held by other top lawyers in the same geographic and legal practice area.
Fangli Chen Ph. Dr. is a top attorney recognized by Best Lawyers in the practice area(s) of Biotechnology and Life Sciences Practice and Patent Law. Fangli, who practices law in Boston, Massachusetts, has been recognized since 2016. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Fangli is held by other top lawyers in the same geographic and legal practice area.
Steve Abreu takes a pragmatic approach to trademark clearance, registration and enforcement to help a wide range of enterprises meet their intellectual property protection and business goals. Steve’s clients are varied and include renowned institutions of higher learning, consumer and medical product companies, and specialty magazines. He also represents well-known manufacturers of pharmaceuticals and biotechnology products. Steve’s strategic outlook on trademark and copyright pro...
Our Methodology
Recognition by Best Lawyers is based entirely on peer review. Our methodology is designed to capture, as accurately as possible, the consensus opinion of leading lawyers about the professional abilities of their colleagues within the same geographical area and legal practice area.
The Process
Best Lawyers employs a sophisticated, conscientious, rational, and transparent survey process designed to elicit meaningful and substantive evaluations of the quality of legal services. Our belief has always been that the quality of a peer review survey is directly related to the quality of the voters.