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Trebicka, Viola
Direct Tel: +1 213-443-3243, Direct Fax: +1 213-443-3100
Los Angeles
Tel: +1 213 443 3000 Fax: +1 213 443 3100
New York
Tel: +1 212 849 7000 Fax: +1 212 849 7100

Viola Trebicka is a partner in the firm’s Los Angeles and New York offices.  Viola co-chairs of the firm's Data Privacy and Security Practice, which under her leadership was selected as Law360’s 2023 Practice Group of the Year. Viola specializes in litigating and resolving data disputes for companies, with a focus on the crucial technology aspects inherent in most company operations. This includes mitigating legal risks across various data-related contexts, including data privacy, data security, artificial intelligence applications, trade secrets, and intellectual property.

On the data privacy front, Viola is lead counsel for technology companies in state and federal courts across the country, defending high-profile data privacy class actions regarding cutting edge technologies.  She has delivered major wins for clients, including a summary judgment win for Google in the Calhoun v. Google data privacy class action, which the Daily Journal featured as one of the Top Verdicts in 2022.

Viola also regularly represents clients in data breach litigation, and has secured motion to dismiss victories for her clients in this space. Viola is equally experienced in addressing data breach incidents, including by leading the incident response, liaising with law enforcement, and addressing regulator and government concerns.   

In recognition of her experience and victories, Ms. Trebicka was recognized in the Lawdragon 500 Leading Global Cyber Lawyers and ranked by Legal 500 USA in the Data Privacy and Data Protection field (Media, Technology, and Telecoms) in both 2023 and 2024.

  • AIG
  • Barnes & Noble
  • CaptureRX
  • C.J. Segerstrom and Sons
  • Conagra
  • Digital River
  • Hyundai Motor America
  • Kia Motors America
  • Mattel, Inc.
  • MassMutual
  • Novatel Wireless
  • Pacific Gas and Electric Company
  • Verizon
  • University of Southern California
  • Zynga


  • Currently defending Kaseya US LLC, an information technology managements and security software provider for managed service providers and small to medium sized business, in a lawsuit in Florida federal arising from a ransomware attack against Kaseya perpetrated by the cyber terrorist gang REvil in July 2021.
  • Currently defending Google in a high-profile privacy class action regarding various Google offerings including Chrome, Google Analytics, and Google Ad Manager.  The complaint asserts federal and state wiretapping claims, as well as state constitutional and common law privacy claims, on the allegation that Google receives users’ communications with websites and personal information when users are browsing the web in “private” or “incognito” mode.
  • Currently defending Google in a high-profile privacy class action alleging that Google improperly obtains browsing data when users have not opted to sync the Google Chrome browser with their Google account. The complaint asserts various federal and state claims, including wiretapping claims, state constitutional and common law privacy claims. 
  • Currently representing major companies who were users of U.S. rail freight services asserting antitrust claims against BNSF, CSX, Norfolk Southern and Union Pacific. The central allegation is that defendants colluded to use fuel surcharges as a means to impose inflated rail freight rates from July 2003 through December 2008. The cases are pending in various federal courts around the country.
  • Currently representing a putative class of individuals who claim they paid ATM access fees at anticompetitively high levels as a result of an unlawful agreement among the dominant ATM networks and the nation’s largest retail banks.
  • Obtained a complete defense jury verdict of no-infringement on four asserted patents for defendants Verizon Wireless and Novatel Wireless in a patent infringement matter relating to mobile hand-off and relay technology.
  • On behalf of Songkick, sued Ticketmaster and Live Nation for antitrust violations in the artist presale ticketing services market.  After completing fact and expert discovery, defeated the defendants’ summary judgment motion in its entirety (which no antitrust plaintiff had previously been able to accomplish against Ticketmaster) and subsequently resolved the case two weeks before trial with a $110 million settlement payment and acquisition of Songkick’s assets for a confidential amount.
  • Successfully defended Barnes & Noble in class action alleging various violations of the Labor Code, including failure to provide meal breaks and rest breaks and failure to pay overtime. The Court denied certification in its entirety.
  • For Mattel, obtained order from Ninth Circuit vacating verdicts of liability for alleged trade-secret misappropriation and damages award of more than $170 million; separately defeated antitrust claims purportedly worth $3 billion and RICO claims with similar alleged stakes; and obtained summary judgment on trade-secrets claims allegedly worth $1 billion.
  • Yale Law School
    (J.D., 2007)
    • Yale Journal for International Law:
      • Submissions Editor
  • University of Richmond
    (B.A., summa cum laude, Interdisciplinary Studies, 2004)
    • Mace Award 2004 to the most outstanding graduating student
    • C. Evans Award for Outstanding Achievement in Scholarship
    • Phi Beta Kappa
  • The State Bar of New York
  • The State Bar of California
  • United States Court of Appeals:
    • Ninth Circuit
  • United States District Court:
    • Central District of California
  • Albanian
  • German
  • Debevoise & Plimpton, LLP:
    • Associate, 2007-2010
  • UN Commission on International Trade Law, Vienna, Austria:
    • Visiting Scholar on International Commercial Arbitration issues, worked on revision of UNCITRAL Arbitration Rules, 2007
  • Legal 500 USA, Media, Technology, and Telecoms: Cyber Law (including Data Privacy and Data Protection), “Recommended Lawyers”, 2023 and 2024
  • Lawdragon 500 Leading Global Cyber Lawyers for Data Privacy & Security Litigation, 2024
  • Southern California “Rising Star” (2014-2018)
  • Southern California “Top 50 Up-And-Coming Women Attorneys” (2017)