FacultyFaculty/Author Profile
Denis J. Sullivan

Denis J. Sullivan

Barclay Damon, LLP

Syracuse, NY, USA

Denis Sullivan is a nationally recognized intellectual property lawyer and leads Barclay Damon’s Intellectual Property Group. Clients value the depth and breadth of Denis’ capabilities. As a registered Patent Attorney, he handles patent infringement disputes (in federal district court and at the International Trade Commission), patent office proceedings (inter partes reviews and reexaminations), and the preparation of patent applications. His experience as both a patent litigator and a patent prosecutor enables Denis to successfully challenge and defend patents (under the America Invents Act) before the U.S. Patent & Trademark Office. He regularly serves as lead counsel in inter partes reviews of patents involved in district court litigation.

Denis’ ability to provide clients with high-value intellectual property counsel is enhanced by his strong engineering background. He graduated first in his class with a bachelor’s degree in electrical engineering and worked for several years as a licensed professional engineer. This technical background enables Denis to handle patent matters in a wide variety of technologies and industries, including healthcare, telecommunications, semi-conductor manufacturing, and oil & gas industries.

After graduating first in his class from New York University Law School, Denis began his legal career as an intellectual property litigation associate at Kirkland & Ellis. He later joined an intellectual property boutique, where he became managing partner before joining Barclay Damon in 2011.


New York Law School, J.D., summa cum laude (Class Rank: 1), New York Law School Law Review, 2002

Manhattan College, B.S., summa cum laude (Class Rank: 1), General Excellence Award in Electrical Engineering, 1993


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