Mackenzie S. Wallace

Mackenzie S. Wallace

  • 214.969.1404
  • |
  • |
  • |
  • |


  • Thompson & Knight LLP
    One Arts Plaza
    1722 Routh Street, Suite 1500
    Dallas, TX 75201 USA
View Mackenzie S. Wallace's

Mackenzie S. Wallace focuses her practice on federal and state trial actions involving healthcare, securities, white collar, financial institutions, energy, aviation, and general business and commercial litigation. She has extensive experience representing healthcare providers in coverage and reimbursement disputes; fraud, and civil RICO claims; Texas Prompt Pay Act, qui tam, and False Claims Act litigation; and matters relating to the violation of federal and state anti-kickback provisions and Stark laws.

In addition, Mackenzie has expertise in working with clients on various aspects of white-collar criminal litigation, shareholder and securities litigation, corporate and shareholder rights, director and officer litigation, and merger litigation.


Healthcare Litigation

  • Represented hospital and healthcare providers in managed care disputes with insurance companies, including Aetna, BlueCross and BlueShield, Cigna, Humana, and United Healthcare
  • Represented out-of-network healthcare providers in reimbursement litigation for services rendered to insured patients
  • Assist in representing hospitals in litigation and compliance matters involving fraud and abuse allegations, qui tam actions, and reimbursement issues in several Texas cities; cases involve numerous federal and state health laws and regulations, including the federal anti-kickback statute, the federal physician self-referral law (also known as the Stark Law), and the federal False Claims Act
  • Assist in managing a national pharmaceutical company’s response to a Civil Investigative Demand from the Texas Attorney General’s Office requesting documents related to the company’s drug price reporting to the Texas Medicaid Program
  • Representing a healthcare provider in matters related to a third-party subpoena in Federal Court
  • Representing a healthcare provider in responding to civil investigative demands (CIDs) from the federal government
  • Representing healthcare providers enforcing their rights under the Texas "prompt pay" statutes

Securities Litigation

  • Represented former NASDAQ-listed oil and gas company and former executives in lawsuits related to $4.4 billion tender offer and merger, including injunction and class certification hearings
  • Representing the Trustee in In re Life Partners Holdings, Inc., handling asset seizures and liquidation, investor claims and distributions, and third-party litigation to maximize the value of the debtor’s estate
  • Represented the Receiver in SEC v. Stanford International Bank, handling outside litigation
  • Represented the Receiver in SEC v. Millennium Bank, et al., handling investor claims and distributions and third-party litigation to maximize the value of the Receivership Estate

Commercial Litigation and Other Representative Matters

  • Representing multiple plaintiffs in a federal class action lawsuit against the Travis County District Attorney’s office and the Austin Police Department regarding the handling of sexual assault cases
  • Representing a manufacturer in direct and indirect purchaser putative class actions regarding an alleged conspiracy to fix prices
  • Obtained summary judgment for a real estate company in multiple cases involving claims for past and future rents under a long-term lease
  • Represented a subcontractor against claims by an owner and general contractor for construction defects in an arbitration proceeding
  • Represented a major medical device manufacturer in a case involving claims of strict products liability and negligence in Florida federal court
  • Assisted in obtaining complete dismissal of all claims, including breach of contract and tortious interference with contract, against a private educational system in Illinois state court in a case involving claimed multimillion dollar damages

Prior Experience

  • Judicial Intern, Honorable Martin Hoffman, 68th District Court, Dallas, Texas, 2010


  • Top 50 Texas Women Up-and-Coming Attorneys, Texas Rising Stars® by Thomson Reuters; 2019
  • Top 100 Texas Up-and-Coming Attorneys, Texas Rising Stars® by Thomson Reuters; 2019
  • Texas Rising Stars® by Thomson Reuters (Business Litigation); 2016-2019

Activities (Memberships/Affiliations)

  • Member, Federal Bar Association - Dallas Chapter; President, 2017-2018; President Elect, 2016-2017; Vice President, 2015-2016; Secretary, 2014-2015
  • Member, Dallas Association of Young Lawyers; Co-Chair, Ask-A-Lawyer Committee 2013-2016; Freedom Run Committee, 2013-2016; 2014 DAYL Leadership Class
  • Member, Texas Association of Defense Counsel (TADC); Young Lawyers Committee
  • Member, National Center for State Courts; Young Lawyer Committee
  • Member, Dallas Bar Association
  • Member, DRI-The Voice of the Defense Bar
  • Member, Women's Energy Network
  • Member, Make-A-Wish Foundation; Dallas Area Regional Advisory Council; Founding Member, Young Leaders Council; Chair, Walk for Wishes, 2016
  • Member, Heroes for Children, Heroes and Handbags Host Committee, 2017
  • Member, Cattle Baron's Ball, 2018