Trent Norris litigates complex scientific and technical disputes involving consumer protection, advertising, environmental, product safety, and food and drug law.

Mr. Norris represents manufacturers and retailers of everyday products and services. His work involves diverse products, technologies, and industries, including foods, beverages, dietary supplements, cosmetics, hospitality, medical devices, electronics, vehicles, and pharmaceuticals. He often represents trade associations and joint defense groups in strategic counseling and litigation.

Mr. Norris represents clients regarding regulation of consumer products and services, with an emphasis on reporting and labeling requirements. Common issues include preemption, commercial speech, interstate commerce, citizen enforcement, jurisdiction, and class action requirements.

Mr. Norris has advised and defended hundreds of companies regarding California's unique toxics and labeling law, Proposition 65, and California's expansive consumer protection laws. Chambers USA (2012) notes that he "is renowned as one of the region's leading experts in toxic tort and Proposition 65 matters. Clients particularly laud his ability to focus on the issues at the core of the problems they take him."

Mr. Norris served as a legislative aide to a US Senator and as an Editor of the Harvard Law Review. He headed the firm's Northern California offices from 2008 to 2013.

Mr. Norris is registered as a lobbyist before the California Environmental Protection Agency and its sub-agencies.


  • Several retailers and manufacturers of cosmetics, drugs, and dietary supplements concerning slack fill allegations by California District Attorneys and consumer class action attorneys.
  • Leading grocery chain in consumer class action alleging failure to use rewards card database to contact consumers regarding food recalls.
  • Private label manufacturer of flushable wipes in Federal Trade Commission proceeding.
  • Leading software as a service provider in defeating consumer class action challenging subscription and cancellation policy.
  • Major retailer in defeating consumer class action alleging failure to disclose trans fat levels in food products.

  • Major restaurant system in defeating two nationwide and four state class actions challenging nutritional information on menus.
  • Major manufacturer of joint health products in purported nationwide class action alleging false advertising regarding product benefits.
  • Cosmetic manufacturer in Lanham Act challenge to competitor's labeling.
  • Leading satellite radio provider in class action alleging unlawful recording of calls to customer service numbers.
  • Civil Justice Association of California in passage of initiative reforming California's consumer protection laws.


Overview of California Regulatory Developments
Presenter, Arnold & Porter Webinar for Personal Care Products Council
Half Full or Half Empty? Update on Slack Fill Litigation and Legislation
Arnold & Porter Webinar
New Challenges of Proposition 65 for the Dietary Supplement Industry
Speaker, ACI/Council for Responsible Nutrition Legal, Regulatory and Compliance Forum on Dietary Supplements, New York, NY
Court Limits California Prosecutors' Reach in UCL Cases
CEQA and Proposition 65: Citizen Enforcement at its Best or Overused Statutes in Need of "Reform"?
Speaker, Private Enforcement in California—Challenges in the Trump Era, California Lawyers Association, Oakland, CA


National Law Journal
Litigation Trailblazer (2018)
Best Lawyers
Litigation: Environmental (2007-2019)
"San Francisco Lawyer of the Year" – Litigation: Environmental (2017)
Chambers USA
Environment (California) (2005-2018)
Food & Beverages: Regulatory and Litigation (Nationwide) (2013-2018)


  • JD, Harvard Law School, 1992, magna cum laude
  • BA, Computer Science, Brown University, 1986, magna cum laude
  • California
  • District of Columbia
  • Supreme Court of the United States
  • US Court of Appeals for the Sixth Circuit
  • US Court of Appeals for the Ninth Circuit
  • US Court of Appeals for the Tenth Circuit
  • US District Courts for the Central, Eastern, Northern, and Southern Districts of California
  • US District Court, Northern District of Illinois
  • US District Court, Eastern District of Texas
Government and Military Service
  • Legislative Assistant (Appropriations, Environmental, Public Lands, and Transportation), US Senator Wyche Fowler, Jr.
  • Editorial Board, Association of Business Trial Lawyers (Northern California) Report (2002-2014)
  • Alumni Advisory Board, Harvard Environmental Law Society
  • Chair, Advisory Board, Prop 65 Clearinghouse (2006); Member (2004-present)
  • Chair, Editorial Advisory Board, Prop 65 News (2001-2004)
  • Lawyer Representative (N.D. Cal. 2010-13)
  • Bar Association of San Francisco
  • Member, Bay Area Lawyers for Individual Freedom (BALIF)
  • Board of Directors, The Peter M. Cicchino Social Justice Foundation (2000-2015)
  • Magistrate Judge Merit Selection Committee (N.D. Cal. 2011)
  • Fellow, American Bar Foundation
  • Advisory Board, Green Chemistry Clearinghouse

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