Skip to content


Mackenzie S. Wallace is a trial attorney focused on healthcare, securities, antitrust, white collar, 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.


Named to Top 50 Texas Women Up-and-Coming Attorneys by Texas Rising Stars® 2020

Named to Top 50 Texas Women Up-and-Coming Attorneys by Texas Rising Stars® 2019

Representative Matters

  • Represented hospital and healthcare providers in managed care disputes with insurance companies, including Aetna, BlueCross BlueShield, Cigna, Humana, and UnitedHealthcare
  • Obtained a $65 million jury verdict in favor of the Life Partners Creditors’ Trust in a case against Life Partners’ founder and former CEO, its former general counsel and president, and various other entities related to a fraudulent scheme involving the sale of life settlements
  • 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
  • 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
  • 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

Prior Employment

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

Honors & Affiliations


  • One to Watch, The Best Lawyers in America® by Woodward/White Inc. (Commercial Litigation, Health Care Law), 2021
  • Rising Star, The Legal 500 US by Legalease (Dispute Resolution: General Commercial Disputes), 2019
  • Texas Rising Stars® by Thomson Reuters (Business Litigation), 2016-2020; Top 50 Texas Women Up-and-Coming Attorneys and Top 100 Texas Up-and-Coming Attorneys, Texas Rising Stars® by Thomson Reuters, 2019-2020
  • “Best Lawyers Under 40 in Dallas” by D Magazine, 2020


  • Council Member, State Bar of Texas, Antitrust and Business Litigation Section, 2020-2023
  • Member, Dallas Bar Associations’ Women Empowered to Lead, 2020
  • 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

Education & Admissions


  • J.D., 2011, cum laude, Baylor Law School; Articles Editor, Baylor Law Review; Dean’s List; Order of the Barrister; Quarterfinalist, Baylor University Dawson & Sodd Moot Court Competition; Baylor Law School Dean’s Scholarship
  • M.A., 2007, Baylor University; Graduate and Research Assistant Scholarship
  • B.B.A., 2007, cum laude, Baylor University; Business Excellence Scholarship Team (BEST); Dean’s List; Who’s Who Among American College Students; Delta Delta Delta


  • Texas
  • U.S. Dist. Ct., E. Dist. Texas
  • U.S. Dist. Ct., N. Dist. Texas
  • U.S. Dist. Ct., S. Dist. Texas
  • U.S. Dist. Ct., W. Dist. Texas