Tiffany Cheung
Clients seek out Tiffany for her successful track record in defending class action claims on behalf of clients in a broad range of industries, including technology, healthcare, and consumer product companies.
Tiffany leads high-stakes class actions at the cutting edge of innovation and technology. She has a successful track record of defending industry-leading clients in their most complex class actions. She also has advised extensively on privacy matters, unfair business practice claims and consumer advertising issues. Tiffany is co-chair of the firm’s Technology Industry Group and a former co-chair of MoFo’s global Litigation Department and the firm’s Complex Litigation + Advisement Practice Group.
The Daily Journal named Tiffany to its 2023 list of Top Women Lawyers and listed her as a 2023 Leading Commercial Litigator in California. Chambers USA 2025 again ranked her in commercial litigation, while The Legal 500 2024 again recommended her in product liability and marketing and advertising. Lawdragon named Tiffany on its 2025 list of 100 Leading AI & Legal Tech Advisors. BTI Consulting Group has recognized Tiffany as one of a small group of attorneys nationwide who represent the “absolute best of the best” in the area of client service. Her clients include leaders in the technology, healthcare, financial services, and retail sectors.
Because she is committed to the firm’s pro bono program, Tiffany works on diverse matters in that arena, including representing numerous clients in connection with guardianship and immigration proceedings.
Tiffany earned her B.A. with high honors from the University of California, Berkeley and was a member of Phi Beta Kappa. She received her J.D. from the University of California, Boalt Hall School of Law, where she was editor-in-chief of the Asian Law Journal. Following law school, she was a judicial clerk for the Honorable Marian Blank Horn of the United States Court of Federal Claims and also served as a judicial clerk for the Honorable Susan R. Bolton of the United States District Court for the District of Arizona.
Experience
Wiretap Act Class Action for Technology Company
Obtained complete dismissal with prejudice of all claims in a class action asserting claims under the federal and California state wiretapping statutes. Plaintiff alleged that the client violated wiretapping laws when the text messaging platform unlawfully “intercepted” confidential communications sent by individuals to the client’s celebrity clients. The Ninth Circuit affirmed the decision.
BIPA Class Action for Social Media App
Defended client and its affiliates in five separate privacy class actions related to two popular dating apps. The litigation chiefly asserted claims under Illinois’s Biometric Information Privacy Act (BIPA).
RICO and Fraud Class Action for Waste Management Company
Defending client in a class action asserting RICO, fraud, and a range of state law claims alleging that the client improperly obtained rate increases for its services.
Copyright Class Action for AI Company
Representing client in a putative class action involving allegations that defendant developed and released generative AI systems that allegedly violate copyright laws.
CCPA and Data Breach Class Action for Leading Software Company
Represented a cloud-based software company in a putative class action filed under the California Consumer Privacy Act, alleging that the company was responsible for a data security incident on its e-commerce platform that resulted in the improper disclosure of consumers’ personal information.
TCPA and Other Class Actions for Major Technology Company
Representing technology company in consumer class actions pending in courts around the country, challenging, among other things, recruitment practices, cancellation fees, and sending texts to consumers. In one of these matters, achieved a ruling in favor of defendant after a bench trial.
Wiretap Act Action Against a Major Consumer Electronics Manufacturer
Represented a consumer electronics manufacturer in class action involving alleged violations of the Wiretap Act and unfair competition claims. Defeated class certification and achieved summary judgment in favor of defendant, which was affirmed by the Ninth Circuit.
Rankings
Ranked in Privacy & Data Security: Litigation
Chambers USA 2024-2025
Recommended in Dispute Resolution: General Commercial Disputes
The Legal 500 US 2024-2025
Recommended for Cyber Law: Data Privacy and Data Protection
The Legal 500 US 2023-2025
Recommended for Pharmaceutical and Medical Devices Defense
The Legal 500 US 2023-2024
Recommended for Toxic Tort Defense
The Legal 500 US 2023-2024
Recommended for Consumer Products Defense
The Legal 500 US 2023-2024
Listed as a "Leading Commercial Litigator" in California
The Daily Journal, 2023
Listed as one of the "Top Women Lawyers" in California
Ranked in Litigation: General Commercial
Chambers USA 2021-2025
Listed as Notable Practitioner in Retail
Named "Other Key Lawyer" - Advertising and Marketing Litigation
Recommended for Media, Technology and Telecoms: Marketing and Advertising
The Legal 500 US, 2016-2024
Mentioned for Media, Technology and Telecoms: Marketing and Advertising, United States
Client Service All-Star
Recommended for Privacy and Data Security Law