Kathleen M. Mahan

Kate practices business litigation in state and federal courts as well as in arbitration proceedings. She assists clients in the areas of corporate governance disputes, contract actions, employment matters, trade secrets, trademarks, copyrights, and other forms of intellectual property litigation and other commercial disputes.  Kate also provides mediator and arbitrator services in a wide range of business disputes, and is Rule 32 certified with the New Hampshire Superior Court for all New Hampshire counties.

Kate received her J.D., cum laude, from Suffolk University Law School (2005) and her B.A., cum laude, from Saint Anselm College (2002). Prior to joining the firm, Kate clerked for the New Hampshire Supreme Court for two years and for the New Hampshire Superior Court for two years.

Kate currently sits on the New Hampshire Bar Association Board of Governors as a Member at Large as well as the New Hampshire Bar Foundation Board of Directors.  In addition, Kate also enjoys participating directly with judges and other practitioners on New Hampshire Federal Court Advisory Committee as well as the New Hampshire Bar Association’s Committee on Cooperation with the Courts, where she has worked on several subcommittees to develop litigation guidelines for New Hampshire’s state courts.  

Honors and Distinctions:

Best Lawyers – Commercial Litigation, Litigation – Intellectual Property

Superlawyers – Top Rated Business Litigation 


Kate is admitted to practice in the New Hampshire State courts, Massachusetts State courts, the United States District Courts for the Districts of New Hampshire and Massachusetts, as well as the United States Bankruptcy Court for the District of New Hampshire.


New Hampshire Bar Association

Massachusetts Bar Association

American Bar Association

New Hampshire Women’s Bar Association


Tips for Finding and Vetting an Expert Witness, The Women Advocate, August 2017 (with Heather Menezes)

The Move Toward Electronic Presentation of Evidence, NH Bar News, December 20, 2017

Protecting a Company’s Assets, Trademarks Included  – NH Bar News, 2017 (with Emily Penaskovic)

Professional and Civic Affiliations:

United States District Court, District of New Hampshire Federal Court Advisory Committee (2019-present)

NH Bar Association, Board of Governors – Governor at Large (2019-present)

NH Bar Foundation, Board of Directors – Director (2018-present)

NH Bar Association, Committee on Cooperation with the Courts (2016-present)

Daniel Webster Batchelder, American Inns of Court (2010-present)

American Bar Association, Member (2016-present)

President, Saint Anselm College Alumni Council

New Hampshire Young Lawyer Delegate to the American Bar Association, House of Delegates (2016-2018)

Leadership Greater Manchester (2018)

NH Bar Association Leadership Academy (2015)