Tiffany Cheung

Partner | San Francisco | (415) 268-6848
(415) 268-6848
The key to planning and implementing the right litigation, compliance, and privacy strategy is to develop and maintain a strong partnership with our clients.

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. She represents numerous Fortune 500 companies in high-stakes litigation involving privacy and marketing claims in courts throughout the United States. Her practice includes leading class actions at the cutting edge of privacy law, including claims involving data security and biometric information. She also has advised extensively on Telephone Consumer Protection Act (TCPA) matters, as well as cases involving unfair business practice claims and consumer advertising issues. Tiffany is a former co-chair of MoFo’s global Litigation Department and the firm’s Class Actions & Mass Torts Practice Group.

The Daily Journal recently named Tiffany as one of the 2021 “Top Women Lawyers” in California, and Chambers USA ranked her in commercial litigation and retail, while Legal 500 recommended her in marketing and advertising. 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.

She is a former editor of, and frequent contributor to, the Morrison & Foerster’s Class Dismissed blog and a contributing editor of the TCPA Report section of MoFo’s Financial Services Quarterly Report. As a thought leader, Tiffany often speaks to groups of industry peers about key developments in class action privacy litigation.

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 proceedings and immigration proceedings for children.

More About Tiffany

Tiffany earned her B.A. from the University of California, Berkeley with high honors and was a member of Phi Beta Kappa. In 2000, 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. From 2000 to 2001, 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 from 2001 to 2002.

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  • Representing 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 ecommerce platform that resulted in the improper disclosure of consumers’ personal information.

  • Represented a gaming and hospitality company in a class action matter for alleged violation of the Biometric Information Privacy Act. Defended against allegations that client unlawfully captured, collected, possessed, received, transferred and used biometric information and identifiers of plaintiffs by extracting facial recognition data without appropriate consent.

  • Representing technology company in consumer class actions pending in courts around the country, challenging such things as recruitment practices, cancellation fees, and sending texts to consumers (i.e., TCPA claims). In one of these matters, achieved a ruling in favor of defendant after evidentiary hearing in the Northern District of California.

  • Represented technology company in a case involving data breach claims based on allegations of improper disclosure of personal identifying information, including social security numbers.

  • 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.

  • Defeated a litigated class certification motion in a putative nationwide class action alleging that defendant made auto-dialed calls to cell phones without consent.

  • Represented a pharmaceutical manufacturer in multi-district federal and state court litigation brought by states and counties against dozens of pharmaceutical companies involving the alleged overpayment by the Medicaid program for prescription drugs. All related cases settled on a favorable basis.

  • Represented wireless carrier in coordinated multi-district litigation of more than 30 putative class actions that challenged charges for data usage by the wireless carrier.



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