Trenton H. Norris

Member of the Editorial Board, Abtl Report at Association of Business Trial Lawyers - Northern California Chapter

Trenton H. Norris

Trenton H. Norris

Member of the Editorial Board, Abtl Report at Association of Business Trial Lawyers - Northern California Chapter


Arnold & Porter LLP
Trenton H. Norris
Related Practices

Consumer Product Safety
Consumer Protection and Advertising
FDA and Healthcare
Product Liability Litigation
Legislative and Public Policy

Practice Focus
▼ Litigation ▶ Consumer Protection and Advertising


Trent Norris, a senior partner in the firm's San Francisco and Silicon Valley offices, litigates complex scientific and technical disputes in the areas of consumer protection, advertising, product liability, product safety, environmental, and food law.

Mr. Norris' clients are primarily manufacturers and retailers of everyday products and services. His cases have involved diverse products, technologies, and industries, including dietary supplements, cosmetics, restaurants, hotels, amusement parks, plumbing products, medical devices, soft drinks, glassware, snack foods, vaccines, home electronics, paints, motor vehicles, pharmaceuticals, and batteries. He often works with trade associations and joint defense groups in these industries.

Mr. Norris represents clients regarding federal, state, and local regulation of consumer products and services, with an emphasis on reporting and labeling requirements. Common issues in Mr. Norris’ matters are preemption, commercial speech, interstate commerce, citizen enforcement, jurisdiction, and class action requirements. Common opponents are state attorneys general, local district attorneys, state regulatory agencies, and citizens groups.

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 the top legislative aide to a US Senator on appropriations, environmental, and transportation issues (1987-89). He was Editor of the Harvard Law Review (1990-92). He headed Arnold & Porter’s San Francisco and Silicon Valley offices from 2008 to 2013, and he regularly speaks to law students concerning the economics of law practice.
Litigation Representative Matters

Consumer Law

Represent six national restaurant systems in defeating claims by animal rights advocacy group that Proposition 65 warnings are required on grilled chicken products (now on appeal)
Represented major restaurant system in defeating two nationwide and four state class actions alleging inaccuracies in nutritional information provided on menus
Represented 17 manufacturers and retailers of multivitamins in Proposition 65 litigation by the California Attorney General and multiple District Attorneys
Represented major food manufacturer in regulatory proceedings and litigation brought by California Attorney General and citizens groups to require Proposition 65 warnings on snack foods
Represented leading satellite radio provider in class action alleging unlawful recording of calls to customer service numbers
Represented major manufacturer of yogurt products in purported nationwide class action alleging false advertising regarding the benefits of the products
Represented several retailers and manufacturers of cosmetic and dietary supplement products concerning slack fill allegations by California District Attorneys
Represent three major manufacturers concerning allegations that breakfast cereal requires a warning for acrylamide created in cooking
Represented major manufacturer of Bluetooth wireless headsets in defending multidistrict litigation alleging that warnings are required for noise-induced hearing loss
Represented nine manufacturers and retailers of red yeast rice dietary supplements regarding allegations that the products require warnings under Proposition 65 and related laws
Advise numerous dietary supplement manufacturers and retailers concerning allegations of non-compliance with California consumer laws and Proposition 65
Represented global beverage company regarding allegations that soft drink bottles illegally imported and sold in California by others require a warning under Proposition 65
Represented 21 manufacturers and retailers of progesterone creams regarding allegations that they require warnings under California consumer laws and Proposition 65, resulting in published decision affirming the reform of California's consumer protection laws
Represented several manufacturers and retailers of ginseng supplements in defending claims that ingredient lists were inaccurate as a result of change in federal law
Advise numerous restaurants concerning nutritional labeling and other menu disclosures
Represented manufacturers and retailers of kava supplements in defending class action claiming that the products require warnings
Represented manufacturer of vaccines in litigation alleging that preservatives used in childhood vaccines result in autism, resulting in published decision upholding treatment of prescription medications under Proposition 65

Product Safety

Advised major restaurant chain concerning regulatory requirements and nationwide recall of promotional items
Represented three pharmaceutical companies in personal injury case alleging inadequate packaging and failure to warn
Represented vaccine manufacturer in litigation alleging that preservatives used in childhood vaccines result in autism, resulting in published decision upholding treatment of prescription medications under Proposition 65
Represented pharmaceutical company in purported class action alleging that labeling of products resulted in the administration of the wrong medicine to class of patients
Represented medical device manufacturer in asbestos litigation
Represented pharmaceutical company in defending a wrongful death case involving a labor-inducing drug
Represented PhRMA, the Pharmaceutical Trade Association, in providing testimony to California legislature on direct-to-consumer (DTC) advertising legislation


Advise manufacturers and retailers concerning compliance with regulations of the California Air Resources Board, the California Energy Commission, and the California Department of Pesticide Regulation
Represent consumer product manufacturers and retailers in enforcement proceedings before the California Air Resources Board
Advise consumer product trade associations in compliance and regulatory proceedings concerning Proposition 65
Represented manufacturers of plumbing valves in a successful trial of claims that Proposition 65 prohibits the sale of their products in California (ruling affirmed on appeal)
Represented paint manufacturer in a multiparty site cleanup and related cost-recovery litigation

Intellectual Property

Represented major telephone accessory manufacturer in patent infringement litigation and related proceedings before the International Trade Commission
Represented security software manufacturer in trademark cancellation proceedings before the US Patent and Trademark Office and in related trademark infringement litigation
Represent major cellular telephone accessory manufacturer in anticounterfeiting efforts and related litigation
Oversee the patent and trademark portfolio and provide strategic IP advice to a global telecommunications equipment manufacturer and a global hearing aid manufacturer
Represented a major wood products company in establishing precedent providing additional protection to commercial trade secrets submitted to government agencies
Represented pharmaceutical and dietary supplement companies as plaintiffs in trademark infringement actions


Chambers USA: America's Leading Lawyers for Business 2013 for Food & Beverages: Regulatory & Litigation

Chambers USA: America's Leading Lawyers for Business 2005-2013 for Environment

The Best Lawyers in America 2012 for Environmental Law

Northern California Super Lawyers 2004-2012; Top 100 (2011)

Named to Daily Journal's "Top 100: California's Leading Attorneys of 2010"

Who's Who Legal: California 2009 for Environment

Selected as one of California's "20 Under 40" Lawyers, Daily Journal Extra, 2004

The Legal 500 US 2012 for Litigation: Product Liability and Mass Tort Defense - Consumer Products

JD, magna cum laude, Harvard Law School, 1992
BA, magna cum laude, Brown University, 1986


District of Columbia
Supreme Court of the United States
US Court of Appeals for the Ninth Circuit
US District Court for the Central District of California
US District Court for the Eastern District of California
US District Court for the Northern District of California
US District Court for the Southern District of California
US District Court for the Northern District of Illinois
US District Court for the Eastern District of Texas

RelSci Relationships


Number of Boards


Number of Awards


Contact Data
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Former Partner at Morrison & Foerster LLP

Relationship likelihood: Strong

Partner at Wilson Sonsini Goodrich & Rosati PC

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Former Hearing Examiner at District of Columbia - Board on Professional Responsibility

Relationship likelihood: Average

Former Partner at Arnold & Porter LLP

Relationship likelihood: Weak

Partner at Perkins Coie LLP

Relationship likelihood: Weak

Former Partner at Arnold & Porter LLP

Relationship likelihood: Weak

Former Partner at Arnold & Porter LLP

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Former Partner at Arnold & Porter LLP

Relationship likelihood: Weak

Former Partner at Arnold & Porter LLP

Relationship likelihood: Weak

Partner at Carpmaels & Ransford LLP

Relationship likelihood: Weak

Paths to Trenton H. Norris
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Relationship Science
Trenton H. Norris
Member of the Editorial Board, Abtl Report at Association of Business Trial Lawyers - Northern California Chapter
JD, magna cum laude
Class of 1992

Harvard Law School offers an energetic and creative learning environment, a diverse and dedicated faculty—whose expertise spans a broad array of legal subjects—and a student body that comes from every state in the U.S. and more than 70 countries around the world. Approximately 1,900 students attend HLS each year: 1,680 J.D. students, 160 LL.M. students, and 50 S.J.D. candidates. The faculty includes more than 100 full-time professors and more than 150 visiting professors, lecturers on law, and instructors. The curriculum features more than 260 courses and seminars that cover a broad range of traditional and emerging legal fields. A Harvard Law education prepares students for success in law practice, business, public service, teaching, and more. Most HLS students are pursuing a J.D. (Juris Doctor) degree, while many others are earning an LL.M. (Master of Laws) or the S.J.D. (Doctor of Juridical Science). Harvard Law School also offers many joint degree programs, coordinated programs, and concurrent degree opportunities with other schools within Harvard University. The Law School community is also home to numerous research programs and engaging publications, including books, scholarly periodicals, newsletters, and a weekly student newspaper.

BA in Computer Science, magna cum laude
Class of 1986

Brown University is located in historic Providence, Rhode Island and was founded in 1764. It is the seventh-oldest college in the United States. Brown is an independent, coeducational Ivy League institution comprising undergraduate and graduate programs, plus the Alpert Medical School, School of Public Health, School of Engineering, and the School of Professional Studies.




The Bar Association of San Francisco (BASF) was established in 1872 as a nonprofit legal membership organization that provides San Francisco legal professionals with networking, educational and pro bono opportunities in order to better serve the community. BASF is located in the financial district at 301 Battery Street, between Sacramento and Clay Streets, on the third floor of the Bently Reserve building.Included in the National Register of Historic Places, the Bently Reserve, formerly the Federal Reserve Bank of San Francisco, was built in 1924.


Bay Area Lawyers for Individual Freedom (BALIF) is the nation’s oldest and largest bar association of lesbians, gay men, bisexuals, and transgendered persons in the field of law. Founded in 1980, BALIF represents its members’ interests in the wider San Francisco Bay Area. BALIF members and supporters include San Francisco Bay Area judges, lawyers, law students and legal workers.

Career History
Member of the Editorial Board, Abtl Report
Tenure Unconfirmed



Arnold & Porter LLP, practicing in distinct areas of the law, conducts business worldwide. Their global reach, experience, and deep knowledge allow them to work across geographic, cultural, technological, and ideological borders, serving clients whose business needs require U.S., EU, or cross-border regulatory, litigation, and transactional services. As their practice embraces the rapidly changing international landscape, their firm has become a powerful partner for global business. The company serves sovereign governments, U.S. and European businesses as they expand into emerging markets, multinational corporations as they conduct business in a multitude of locations, and international businesses seeking to navigate the waters of U.S. and European business, regulation, and law. They believe business transformation in a global economy requires innovation and open market access, and by providing the legal structure and foundation for both, they enable their clients to effectively provide products and services to the world's vast marketplace. The company was established in 1946 and is headquartered in Washington, DC.

Boards & Committees
Member, Advisory Board
2004 - Current
Member, Advisory Board
Member, Alumni Advisory Board
Tenure Unconfirmed
Member, Board of Directors
Political Donations
Awards & Honors
Admitted to the California Bar
Admitted to District of Columbia Bar
Court Admission: U.S. District Court for the Northern District of Illinois
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