Contact Info vCARD

T: +1 214.698.3159
F: +1 214.571.2903

Dallas Office
2100 McKinney Avenue
Suite 1100
Dallas, TX 75201-6912, USA


Olivia Adendorff is a senior litigation associate in the Dallas office of Gibson, Dunn & Crutcher.  Ms. Adendorff has handled a wide assortment of antitrust, employment, securities, and general litigation matters, with particular expertise in managing complex commercial class actions.  She has practiced in federal district and appellate courts across the country.

Ms. Adendorff has been involved in a variety of trial proceedings, including arguing against a motion to dismiss in the widely-publicized Tenet Healthcare Corp. v. Community Health Systems, Inc. litigation in the Northern District of Texas.  With respect to her appellate experience, she has practiced before the Fifth, Sixth, Seventh, Ninth, and Eleventh circuit courts of appeal, handling everything from appeals as of right to writs of mandamus and interlocutory review of class certifications.

Representative Matters

  • Counsel for a major U.S. retailer in historic Title VII class action in California and spin-off regional class actions in four other states.  Secured dismissal of class claims at district court level in every spin-off case.  Handled all subsequent appellate review.  Also managed trial team working to defeat individual plaintiffs' Title VII claims and brought claims to successful settlement on eve of summary judgment.
  • Counsel for Cal-Maine Foods, the largest shell egg producer in the United States, in highly complex federal multi-district litigation antitrust class actions, involving direct purchaser, indirect purchaser, and direct action plaintiff claims and coordination with a large number of co-defendants.  Successfully defeated certification of indirect purchaser class and settled with direct purchaser class on terms favorable to the client.
  • Counsel for one of the largest U.S. apparel and home furnishings retailers in litigation involving the terms and conditions of their vacation time for employees in California and Illinois.  Obtained decertification of formerly certified class of employees after taking over case from prior counsel.
  • Counsel for Tenet Healthcare in multi-billion dollar antitrust class action.  Key member of trial prep team, managing preparation of economic experts.  Obtained successful settlement of all claims days before trial.
  • Counsel for one of the largest U.S. apparel and home furnishings retailers in federal securities class action brought under the PSLRA currently pending in the Eastern District of Texas.
  • Counsel for 3M in federal antitrust and patent lawsuits asserting antitrust claims related to 3M's standard-setting activities.  Obtained successful settlement of all claims on the eve of summary judgment.
  • Counsel for Mary Kay in class action litigation in California involving allegations of common law fraud and consumer protection law violations.  Forced the named plaintiff to voluntarily dismiss own claims after challenging an improper relationship between the named plaintiff and the attorney seeking to represent the class.
  • Counsel for AlixPartners in declaratory judgment action in Illinois.  Successfully obtained injunction prohibiting former employee from bringing class action claims in arbitration.
  • Counsel for Frito-Lay in declaratory judgment action seeking declaration of ownership and inventorship of various patents, related to case pending before United Kingdom High Court of Justice, Patents Court.
  • Sought emergency writ of mandate from California Court of Appeal seeking disqualification of a trial judge in a large consumer protection class action on the eve of summary judgment due to the judge's membership in the class.
  • Successfully defended non-profit organization against sexual discrimination charges before the EEOC.
  • Successfully defended Dallas County Judge in action seeking a preliminary injunction related to the legislative decisions of the Dallas County Commissioners.

Ms. Adendorff received her Juris Doctor degree cum laude in 2009 from Harvard Law School, where she served as Managing Editor of the Harvard Journal on Legislation.  In 2009, she clerked for Chief Judge Sidney Fitzwater in the Northern District of Texas.  In 2006, Ms. Adendorff earned a Bachelor of Arts degree cum laude in Economics from Harvard College.

Ms. Adendorff is an active member of the ABA's Antitrust Section, and served as an editor for the Section's Antitrust Class Action Handbook.  She has also served as an editor for Gibson Dunn's semi-annual antitrust and securities updates.  Mrs. Adendorff serves on the board of the Dallas Summer Musicals and is a member of the Harvard Schools Committee for the Harvard Club of Dallas.  She has also been a member of Attorneys Serving the Community, the Junior League of Dallas, and the Federalist Society.  In addition, she is a former associate of the Higginbotham Inns of Court.

Ms. Adendorff is admitted to practice law in the state of Texas.  She is also admitted to practice before the Northern and Eastern District of Texas and the Ninth Circuit Court of Appeals.


  • Harvard University - 2009 - Juris Doctor
  • Harvard University - 2006 - Bachelor of Arts


  • Texas Bar