Nathan is a Director in the firm’s Concord, New Hampshire office. His work focuses on complex commercial litigation and government investigations in the construction, health care, insurance, and financial services industries. He frequently represents clients in state and federal courts, as well as before numerous state agencies and the Legislature.
Nathan frequently authors publications and provides presentations on a variety of legal topics in the health care and construction industry, as well as developments in data security and breach notification laws, and the changing legal landscape for cannabis-related businesses. Nathan is also one of the editors – including the Honorable Tina Nadeau, Chief Justice of New Hampshire Superior Court – of the treatise A Practical Guide to Evidence in New Hampshire 2nd Edition (2021).
In recognition of his notable work for clients, Nathan has been named multiple times to the “Under 40 Hot List” by Benchmark Litigation, which recognizes the "nation’s most notable up-and-coming litigation attorneys." This list is compiled through a process of both peer review and case examination.
Nathan is an active member of the community. Nathan was named to the 2021 New Hampshire Union Leader 40 Under Forty list recognizing “outstanding Granite Staters making a difference in their communities and professions.” In December 2020, he was appointed by the New Hampshire Supreme Court to serve a three-year term on the Access to Justice Commission. Nathan currently serves on the New Hampshire Campaign for Legal Services Large Firm Committee. He has served on multiple committees of the New Hampshire Bar Association. In November 2019, Nathan was elected to a four-year term as an at-large councilor on the Concord City Council. Previously, he served on the Concord School Board (2015-2018). Nathan also coaches youth baseball and basketball.
During law school, Nathan interned for the United States Department of Justice and The Honorable Mary Ellen Coster Williams at the United States Court of Federal Claims. He was also a member of the law review and national moot court team. After graduation, Nathan practiced law in Washington, D.C., with the international law firm Reed Smith LLP, before returning home to New Hampshire.
- New Hampshire Supreme Court, Access to Justice Commission, Member
- New Hampshire Bar Association, Legislation Committee, Member
Honors & Recognition
- Benchmark Litigation - Under 40 Hot List
- New Hampshire Union Leader - 40 Under Forty
Civic and Charitable Activities
- Concord City Council, At-Large Councilor
- Concord School Board, past member
- Georgetown University Alumni Admissions Program
- New Hampshire Campaign for Legal Services, Large Firm Committee, Member
- A Practical Guide to Evidence in New Hampshire 2nd Edition (2021), Edited by Nathan Fennessy, Hon. Tina Nadeau, Kenneth E. Rubinstein, and Karen A. Schlitzer.
- "Health Reform Legislation Includes Significant Amendments to the False Claims Act," co-author, Federal Forecaster, Vol. VI, No. 2 (Spring 2010)
- "The President Signs a Significant Amendment to the Federal False Claims Act," co-author, Financial Fraud Law Report (September 2009)
- "Sweeping Changes to the Federal False Claims Act Are on the Horizon," co-author, Financial Fraud Law Report (May 2009)
- "Changes to the Federal False Claims Act Are on the Horizon," co-author, Federal Forecaster, Vol. V, No. 2 (Spring 2009)
- Comment, "Bringing Bloggers Into the Journalistic Privilege Fold," 55 Catholic Law Review 1059 (Summer 2006)