California Commercial Litigation and Business Counseling Law Firm
Specialized in Proposition 65

Mr. Castellón is a trial attorney experienced in all aspects of complex business and environmental, toxic tort and worker-death related litigation, including in-court examination of experts. Mr. Castellón also litigates employment law cases involving discrimination or misappropriation of trade secrets.

Mr. Castellón graduated from Saint Mary's College of California with a B.A., History, and B.S., Business Administration/Economics, in May 1985, and from UCLA School of Law in May 1991. He is admitted to practice law in California and Hawaii.

Mr. Castellón is one of the few attorneys in California to have gone to both bench jury trials on alleged toxic lead discharge and exposures, reaching a favorable result for the client in all instances. Mr. Castellón’s experience with scientific evidence extends to various exposures, including heavy metals found in all major water work parts, fittings, pipes, dioxin from incinerators, and heavy metal solvents found in metal and aerospace companies. Mr. Castellón’s high degree of peer recognition and professional achievement is recognized as he is one of only 5% of all Northern California lawyers chosen as a Super Lawyer.

Mr. Castellón was previously the managing partner of the San Francisco office of a Los Angeles based firm. He worked over seven years at his prior law firm where he litigated and tried numerous cases with an emphasis on bad faith and other related insurance coverage actions, environmental actions, professional malpractice actions, as well as actions arising from the False Claims Act, Fair Debt Collection Practices Act and Davis-Stirling Common Interest Development Act.

Admitted to the bar:

  • 1991, California, US District Court, Northern, Eastern and Central Districts of California and US Court of Appeals, Ninth Circuit 
  • 1994, Hawaii


  • UCLA School of Law (J.D., May 1991), Moot Court Honors Program Member, Federal Communications Law Journal Member
  • Saint Mary's College of California (B.A. - History, May 1985, B.S. - Business Administration/Economics, May 1985), Levre Award for Historical Research


“Shift Key - Equitable Remedies Assist Insurers in Regaining Losses”, Los Angeles and San Francisco Daily Journal, October 15, 1998

“Expensive Favor? Courtesy Counsel Held to High Standard of Care”, Los Angeles and San Francisco Daily Journal, June 18, 1998

“Litigation From a Global Perspective”, ABA TIPS COMMITTEE NEWS, Spring/Summer 1998

“Citizen Steel - Supreme Court Hold Group Lacks Standing to Sue”, Los Angeles and San Francisco Daily Journal, April 29, 1998; republished in Arizona Journal, Colorado Journal, and Washington Journal.

“Refugee Redefined: An Inquiry into Mexican Legal Standards Relating to Asylum and Non-refoulment”, Chicano-Latino Law Review, Fall 1992


California/Nevada Automotive Wholesalers’ Association, “What You Should Know About Toxic Litigation in the Event You are Sued? 2003

Proposition 65 News Conference and Annual Seminar, “Kits, Cats, Sacks & Wives: What is Covered by Proposition 65?” 2002

Yosemite Environmental Law Annual Conference, “Citizen Enforcement: Who is suing Whom?” 2001

American Water Works Association California-Nevada Section Mid-year Meeting, “Water and Lead Equals a Legal

Action Under Proposition 65", 2001

American Bar Association Tort and Insurance Committee Annual Mid Year Program, “Is the Duty to Settle Allocable?”, 2001

Cast Metals Association Annual Conference, “Outcome of a Huge Toxic Lawsuit: Neighbor vs. Foundry”, 2000

California Cast Metals Association Annual Conference, “Emerging Trends in Proposition 65 Litigation”, 1998

California Wine Monitoring Group Annual Seminar, “Stormwater Compliance and Prevention”, 1998

Proposition 65 News Conference and Annual Seminar, “Defenses to Proposition 65 Environmental Exposure Claims”, 1998

Chemical Batch Processing Monitoring Group Annual Seminar, “Stormwater Compliance and Prevention”, 1997

California Hispanic Publishers Association Annual Meeting, “Liability and First Amendment Rights”, 1996


  • Member, California and Hawaii State Bar Associations
  • Editorial Board, Insurance Litigation Reporter (Thomson/West Group)
  • Vice Chair and Member, Commercial Business International Committee - American Bar Association
  • Member, Toxic Torts Litigation Committee - American Bar Association
  • Member, National Resources & Environment - American Bar Association
  • Member, California Minority Counsel Program
  • Editorial Board, Bad Faith Law Report, 1999 to 2000
  • Outside General Counsel, California Wine Monitoring Group, 1998
  • Lecturer, Saint Mary’s College of California Paralegal Program, 2003-2005
  • Founding Member, Contra Costa County Hispanic Chamber of Commerce, 1987