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Data, Cyber + Privacy Litigation

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Morrison Foerster Hosts Seminar Exploring Life Sciences Market and Regulatory Trends

Tricks of the Trade: How to Train an LLM in a GDPR Compliant Manner

2024 USD Class Action Law Forum

Pixels, Session Replay, and Website Advertising Technology: Update on Litigation Trends

2023 USD Class Action Law Forum

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Litigation Readiness: Seven Things to Keep in Mind

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Two Morrison Foerster Partners Named Finalists for Law.com Corporate Counsel’s Women, Influence & Power in Law Awards

Morrison Foerster named a leading international firm in Chambers Global 2026

Legal Tech's Predictions for Cybersecurity in 2026

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Morrison Foerster Ranked First In Lexology 100: Data 2026

Privacy & Cybersecurity Litigation To Watch In 2026

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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.

Tiffany Cheung

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Purvi G. Patel is the former managing partner of the Los Angeles office.Purvi represents retail, e-commerce, and other consumer-oriented businesses in significant advertising, unfair competition, consumer fraud, and privacy matters. She has built a robust practice advising household names on various compliance issues and defending them in complex and class action litigation in federal and state courts across the country, winning motions to dismiss, defeating class certification, and securing summary disposition in several multi-million dollar lawsuits. Purvi is a strategic and practical thinker who is in tune with her clients’ priorities, which leads to successful outcomes both inside and outside the courthouse.Practice Leader. Purvi has a defined niche that cuts across the firm’s Consumer Litigation, Class Actions, and Privacy + Data Security Groups. With a focus on businesses’ collection of personally identifiable information (PII), Purvi is a recognized leader in defending lawsuits involving the collection, use, and disclosure of PII. In addition, due to her vast experience handling class action litigation for clients across sectors, Purvi has notched significant victories for industry-leading companies, including securing summary judgment and defeating class certification in some of the most plaintiff-friendly jurisdictions nationwide.Purvi’s extensive litigation experience uniquely positions her to counsel clients on compliance with established and emerging laws and regulations, including the potential privacy implications of business practices relating to the collection of PII. Purvi is an expert in numerous California privacy laws, including the California Consumer Privacy Act, the California Invasion of Privacy Act, and California’s Song-Beverly Credit Card Act (and analog statutes in effect in other states).Purvi is also committed to the firm’s pro bono initiatives and has worked on a number of pro bono matters during her tenure at the firm. Most recently, she represented an interfaith coalition of more than 50 religious organizations as amici in various cases challenging the 2017 “travel ban” Executive Orders. In 2014, Purvi successfully argued a Ninth Circuit appeal on behalf of a U.S. citizen who was wrongfully subjected to two years of pre-trial detention as a result of a detainer imposed by U.S. Immigration and Customs Enforcement (Mendia v. Garcia, 768 F.3d 1009 (9th Cir. 2014)).Firm Leader. Purvi is committed to advancing diversity at Morrison & Foerster. For more than five years, she served as the Co-Chair of the firm’s Diversity Strategy Committee. During her tenure, Purvi contributed significantly to the Committee’s success, including implementing a LGBTQ+ Gender Inclusive Policy, and launching MoFo’s innovative Allies Network. She was the firm’s Leadership Council on Legal Diversity (LCLD) Fellow in 2014 and remains active in the organization as an alumna. In addition, Purvi served as hiring partner for the Los Angeles office between 2015 and 2023.Community Leader. Purvi is also actively engaged in the community. In 2019, she was a founding board member of Legal Education Access Pipeline (LEAP), a fellows program dedicated to increasing access to legal education for underrepresented populations.  She has also been working with “Just the Beginning – A Pipeline Organization” (JTB) since 2015 when she joined an inaugural steering committee of judges, in-house and outside counsel, and educators to launch a Los Angeles-based Summer Legal Institute. She is a past co-president of the South Asian Bar Association of Southern California (SABA-SC), and in 2023, was honored with its Trailblazer award. She was selected for her “trailblazing efforts which have paved the way for a more inclusive and representative profession” and “her commitment to breaking barriers in the legal profession.” In 2019, Purvi was named SABA-SC’s Mentor of the Year.Representative Matters<ul><li>Privacy Class Action Litigation. Defending software development company in two putative class actions brought under state common law based on alleged violations of the federal Children’s Online Privacy Protection Act. Obtained dismissal of putative privacy class action against Southern California grocery store chain, which was affirmed on appeal. </li><li>Class Action Litigation Relating to Consumer PII. Represented national retailers in more than 30 California Song-Beverly Credit Card Act and Massachusetts’ Song-Beverly analog matters arising out of the alleged collection of PII, securing favorable settlements or walkaways for many following early negotiations with plaintiffs’ counsel. Trial attorney for national retailers in two Song-Beverly class actions. For Target Corporation, led pre-MDL team coordinating and managing responses to single-plaintiff and putative class action complaints filed in wake of data breach.</li></ul><ul><li>False Advertising and Consumer Class Action Litigation. Defeated class certification for household-name companies in numerous matters involving consumer protection claims arising out of alleged misrepresentations and omissions as well as lawsuits brought under unfair competition, false advertising, and product liability laws. Also obtained dismissals at the pleadings stage in cases alleging unfair, unlawful, and fraudulent marketing and advertising practices.</li></ul>

Purvi Patel

Katie Viggiani is a partner in Morrison Foerster's Complex Litigation + Advisement group.She specializes in the defense of complex commercial disputes and consumer class actions, crafting strategies that look beyond a single dispute to further clients’ holistic goals inside and outside the courtroom. Katie is a versatile commercial litigator who represents U.S. and international companies in courts and arbitral tribunals throughout the country. Her clients include technology, retail, e-commerce, healthcare, and financial firms from start-ups to Fortune 500 companies.<h4>Consumer Class Actions and Privacy Litigation</h4>Katie regularly represents companies against consumer class actions, including ones asserting privacy claims based on novel theories of liability. She has defended companies against claims under federal wiretap statutes, the Illinois Biometric Information Privacy Act, the California Invasion of Privacy Act, and other privacy laws. She also defends companies in high-profile cases involving data security issues and the handling of sensitive information. <h4>Mass Arbitration, Mass Torts, and Multijurisdictional Claims</h4>Katie has extensive arbitration experience. She helps companies navigate mass arbitrations—the coordinated filing of a large number of nearly identical claims—guiding companies to favorable resolutions and outcomes, including in cases involving parallel class actions. Katie’s practice also includes defending corporate clients in serial mass tort and class action litigation filed and pending in multiple jurisdictions. In 2023, The Legal 500 recommended Katie in Product Liability, Mass Tort and Class Action Defense.<h4>Enforcement Actions and Trial Experience</h4>Katie also represents clients at the intersection of enforcement actions and civil litigation. She has represented clients facing regulatory investigations and enforcement actions involving securities fraud, benchmark manipulation, market manipulation, tax evasion, and accounting brought by the U.S. Department of Justice, Securities and Exchange Commission, Commodity Futures Trading Commission, and Financial Industry Regulatory Authority. Katie was also part of a trial team that represented the founder and former CEO of a high-tech company in a criminal prosecution alleging stock option backdating and improper revenue recognition. The team achieved two separate criminal trial victories, obtaining acquittal on six counts and a hung jury on the one remaining count.<h4>More About Katie</h4>Katie maintains an active pro bono practice with a particular focus on indigent criminal defense, civil rights work, and legal issues facing the LGBTQ+ community. She was a founding member of the firm’s NY LGBTQ+ Affinity Group and is an active member of the MoFo Proud Network and the firm’s Women’s Strategy Committee.Katie earned her J.D. from the UCLA School of Law, where she was a managing editor of the UCLA Women’s Law Journal. While in law school, Katie worked as a law clerk for the Los Angeles County Public Defender and was a member of UCLA’s Criminal Defense Clinic.

Data, Cyber + Privacy Litigation

Ranked #1 firm among GDR 100’s Global Elite

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Practice Ranking: Privacy & Data Security – The Elite

Ranked #1 firm among GDR 100’s Global Elite

Practice Ranking: Cyber Law, Data Protection & Privacy

Practice Ranking: Privacy & Data Security: Litigation

Practice Ranking: Privacy & Data Security

Practice Ranking: Privacy & Data Security: Healthcare

Practice Ranking: Privacy & Data Security – The Elite

Ranked #1 firm among GDR 100’s Global Elite

Practice Ranking: Cyber Law, Data Protection & Privacy

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