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John P. Katerndahl


(949) 623-6018
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5 Park Plaza
Suite 1100
Irvine, CA 92614

Los Angeles
633 West Fifth Street
52nd Floor
Los Angeles, CA 90071

San Diego
101 W. Broadway
Suite 2000
San Diego, CA 92101


J.D., University of San Francisco School of Law, 1986

  • California Supreme Court Judicial Extern

B.A., Stanford University, 1983

  • Major: Human Biology
  • Major: Political Science


  • Italian

John Katerndahl is a Partner in the Los Angeles office of GRSM and is a member of the Environmental/Toxic Tort practice group. John represents manufacturers, suppliers, contractors, and premises owners in toxic tort, product liability, and construction cases, including cases arising out of asbestos and chemical exposures, catastrophic injury and high value property damage. John is called upon to first-chair high value mesothelioma cases in which plaintiffs routinely seek multi-million dollar awards. His clients have included Fortune 500 companies, the world’s largest construction contractor, and an international chemical company. He has tried over 20 mesothelioma cases since 2003 with 15 to verdict and the balance settled after plaintiff’s attorneys dramatically reduced their settlement demands during trial. He has also won defense verdicts in claimed asbestosis and lung cancer cases. Additionally, Johnl has successfully briefed and argued appeals in asbestos cases before the California First District Court of Appeal and the United States Ninth Circuit Court of Appeals.

John's considerable experience in toxic tort/environmental litigation provides him with a unique ability to defend his clients' interests by investigating, evaluating, and marshalling the evidence, working with expert witnesses and participating in expert witness discovery, and serving as a first-chair trial lawyer in high value cases. He works closely with clients, developing strategies for defending the case, and ensuring that clients are notified of significant developments and provided with his recommendations as to the best course of action.

Called upon by clients and insurance claims representatives, John regularly gives presentations on various subject matters relating to toxic tort and product liability cases, including those specifically relating to trying asbestos-related mesothelioma cases and cases in which talc products allegedly caused ovarian cancer or mesothelioma. He has co-authored articles on medical-legal issues in the DRI magazine For the Defense and in the Practicing Law Institute’s Toxic Tort Case Essentials. As a result of his considerable trial experience, John was invited to join the prestigious American College of Trial Advocates (ABOTA).

John is originally from Denver, Colorado and presently resides with his family in Los Angeles.


  • California
  • U.S. District Court Northern, Eastern and Central District of California
  • U.S. Court of Appeals 9th Circuit


  • American Board of Trial Advocates (ABOTA), Member