
Associate
Boston, Massachusetts
- kkossoy@mmmk.com
- Direct: (857) 957-0727
- Fax: (617) 227-3346
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Kate Kossoy is an associate in MMM&K’s Product Liability and Toxic Tort practice group. She focuses her practice on toxic tort, products liability, regulatory compliance, and general liability matters. Since joining MMM&K, Kate has contributed to the firm’s defense of complex litigation matters and assisted in the firm’s product compliance practice. Kate has served as local and national counsel for companies involved in toxic tort products liability actions, defending these companies in various aspects of litigation, including discovery, motion practice, mediation, and settlement negotiations.
Kate has a passion for legal writing and recently co-authored an amicus brief to the Supreme Judicial Court of Massachusetts on behalf of the Massachusetts Defense Lawyers Association regarding the enforcement of liability waivers in Massachusetts.
Kate is licensed to practice law in Massachusetts and New York. Kate earned her law degree from Boston College Law School. She was a member of Boston College Law School’s National Criminal Procedure Moot Court team and competed at the National Criminal Procedure Moot Court Tournament in November 2024 where she finished as a quarterfinalist. Prior to law school, Kate graduated from Villanova University with a Bachelor of Arts after pursuing a dual major of Criminology and Political Science with a minor in Arab & Islamic Studies.
Practice Areas
Awards

Bar Admissions:
Massachusetts, 2025
New York, 2026
Education:
Boston College Law School, 2025
J.D.
Villanova University, 2022
B.A. Criminology, Political Science
Honors: Cum Laude
Professional Associations & Memberships:
Massachusetts Bar Association
Massachusetts Defense Lawyers Association
Defense Research Institute
New York State Bar Association
Publications:
The Fall of Chevron: How the End of 40 Years of Precedent May Impact the Product Liability Practice – International Association of Defense Counsel Newsletter (March 5, 2026), Co-Author