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Kristen F. Mazzeo

Senior Counsel

(215) 561-2300
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Three Logan Square
1717 Arch Street
Suite 610
Philadelphia, PA 19103


J.D., cum laude, Temple University Beasley School of Law, 2015

  • Temple International & Comparative Law Journal
  • Rubin Public Interest Honor Society
  • Trial Advocacy Program
  • City Solicitor Clinic, Philadelphia Law Department
  • Municipal Court of Philadelphia, Mediator for Small Claims Matters
  • Philadelphia Housing Court, Mediator for Landlord/Tenant Claims

B.A., cum laude, Political Science and Business, Houghton College, 2007


Best Lawyers in America® Ones to Watch distinction in Product Liability Litigation - Defendants (2021-2024), Insurance Law (2023-2024), Personal Injury Litigation - Defendants (2024)*

Super Lawyers® Rising Stars distinction in Personal Injury - Products, General Litigation, Environmental Litigation, and Insurance Coverage (2021 - 2023)*


*No aspect of this advertisement has been approved by the Supreme Court of New Jersey.
A description of the Best Lawyers selection methodologies can be found at:
The Super Lawyers® Rising Star list is issued by Thomson Reuters. A description of the selection methodologies can be found at:
Kristen Mazzeo is Senior Counsel in the Philadelphia office of GRSM. She focuses her practice on insurance, product & general liability, and environmental/toxic tort litigation. Kristen has successfully defended corporations and insurance companies in a wide variety of complex litigation matters involving product defects, transportation, premises liability, and insurance coverage. She has experience handling all aspects of litigation from pre-suit investigation through trial, including taking and defending depositions, preparing pleadings and discovery, arguing motions, and attending case management conferences, settlement conferences, arbitrations, and trials. Kristen has hands-on experience consulting with clients and managing legal issues and cases of all sizes from small claims to complex litigation matters involving catastrophic losses, mass torts, and multi-district litigation.
Prior to joining GRSM, she was an associate at a mid-sized defense firm in Philadelphia where she gained experience in complex product defect and toxic tort litigation, defending automotive and consumer manufacturers


  • Pennsylvania
  • New Jersey
  • U.S. District Court, District of New Jersey
  • U.S. District Court, Eastern District of Pennsylvania


  • Defense Research Institute
    • Products Liability Steering Committee, Member
    • Vice Chair of Consumer Goods and Office Equipment
  • Philadelphia Bar Association
  • Pennsylvania Bar Association
  • Philadelphia Association of Defense Counsel

Community Involvement

  • Senior LAW Center
  • Philadelphia LawWorks
Publications & Presentations