Charles Diaz Tressler LLP

Diaz, Charles R. Senior Counsel

Diaz, Charles R. Senior Counsel

Practice Focus

Charles (Chuck) Diaz specializes in complex civil litigation, including insurance coverage and environmental matters.  His practice involves counseling clients at all stages of dispute, and he is frequently retained before a lawsuit is filed in an effort to effectively manage risk.  Chuck has extensive experience representing clients in trial, arbitrations, mediations and all other types of alternative dispute resolution. Throughout his career, he has handled a wide array of litigated and non-litigated matters including complex insurance coverage disputes relating to environmental, toxic tort, product liability, construction defect, employment, reinsurance and bad faith claims under various types of policies.  He has litigated in state and federal courts at both the trial and appellate levels. He also provides coverage analysis, monitors claims and has assisted in drafting policy language, including scripted endorsements. Chuck works closely with his clients to achieve defined goals in the most cost-effective manner.

Professional Background

Prior to joining Tressler, Chuck worked at Archer Norris in the insurance coverage and litigation groups where he advised clients regarding high exposure complex claims and litigation concerning underlying asbestos, hazardous waste, pollution, chemical exposure, employment and tobacco matters, as well as first party property and product-recall claims throughout the country involving general liability, umbrella and excess policies.  He has acted as national insurance coordinating counsel for a supplement product manufacturer and has assisted in the coordination of the defense of mass tort claims. 

Chuck has been recognized by Martindale-Hubbell with AV Preeminent Rating and appointed special counsel on insurance coverage issues in a complex U.S. District Court mass tort bankruptcy proceeding. Chuck was recently selected by his peers in the 27th Edition (2021) of The Best Lawyers in America© for Insurance Law.


Memberships & Affiliations

  • Los Angeles County Bar Association
  • Association of Southern California Defense Counsel



Community Involvement

  • Former Board of Director for Variety Boy’s and Girl’s Club of East Los Angeles, Chaired Capital Campaign which raised over $12 million for new community center and club facility
  • Former Board of Trustee for Pitzer College of the Claremont College