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Matthew S. O'Brien


Matthew practices in a variety of areas, with an emphasis on civil litigation, environmental law and toxic tort and product liability defense.

Matthew represents clients on a wide range of issues throughout the United States. He serves as national counsel for a major American manufacturer, implementing national litigation strategy for multiple substance exposure dockets comprising numerous cases across more than a dozen states.

In the area of toxic tort and products liability defense, Matthew’s experience includes representing clients with diversified products ranging from chemicals (asbestos, benzene, beryllium, solvents and industrial premises) to medical devices (cardiac device, disinfectants, operating room equipment and sterilants).

In the area of environmental law, Matthew served as co-counsel in a breach of contract arbitration involving CERCLA and state agency regulation of contamination sites. Matthew also assists clients navigate state and federal oversite of contaminated sites and manage access and indemnity agreements with off-site or historic Potentially Responsible Parties.”

Government Service
  • Los Angeles Superior Court, Judicial Extern, 2014
  • U.S. House of Representatives, Washington, D.C., Legislative Intern, 2011

Case of Particular Interest
  • Garity v. APWU National Labor Organization, 828 F.3d 848 (9th Cir. 2016): Successfully argued on behalf of a formerly pro se appellant that a prima facie claim for disability discrimination against a union does not require a showing that the union breached its duty of fair representation.