Mackenzie Wallace is a trial attorney representing health care entities, businesses, and business owners and directors in high-stakes litigation.
Hospitals and health care providers turn to Mackenzie in coverage and reimbursement disputes; class actions; 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.
Corporations, business owners, and directors use Mackenzie’s nuanced advice to maneuver shareholder and securities litigation, corporate and shareholder rights, director and officer litigation, merger litigation, complex business divorces, and white-collar criminal litigation. She also helps clients navigate class action lawsuits alleging breaches of fiduciary duty and securities fraud and advises companies and individual directors facing DOJ and SEC investigations. Additionally, Mackenzie represents receivers in multiple SEC receivership actions.
Mackenzie advises many companies regarding antitrust policy and compliance matters, and represents retailers and manufacturers facing antitrust suits.
She also handles cybersecurity policy and litigation, and develops and enforces important privacy and data security policies.
experience
Health Care Litigation
- Represents hospitals and health care providers in managed care disputes with insurance companies.
- Represents health systems in class action litigation.
- Represented out-of-network health care providers in reimbursement litigation for services rendered to insured patients.
- Represented health care providers in regard to investigations of audits and fraud.
- Represented a national pharmaceutical company’s response to a Civil Investigative Demand and defense of alleged violations under the Texas Medicaid Fraud Prevention Act from the Texas Attorney General’s Office related to the company’s drug price reporting.
- Represented health care providers in fraud and civil RICO matters, both as plaintiffs and defendants.
- Represented a health care provider in matters related to a third-party subpoena in federal court.
- Represented a health care provider in responding to civil investigative demands (CIDs) from the federal government.
- Representing health care providers enforcing their rights under the Texas “prompt pay” statutes.
Securities and Corporate Governance Litigation and Internal Investigations
- Representing owner of closely held companies in breach of contract and fiduciary duty derivative arbitration and lawsuit against other members and managers.
- 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 former NASDAQ-listed oil and gas company and former executives in lawsuits related to a $4.4 billion tender offer and merger, including injunction and class certification hearings.
- Represented former board members of a publicly traded oil and gas company over allegations of fraud, breach of fiduciary duty and fraudulent transfer.
- Represented a NYSE-listed jewelry and bullion company in a shareholder derivative suit and 10b-5 class action alleging breaches of fiduciary duty and securities fraud.
- Represented a privately owned animal feed company in relation to minority shareholder inquiries and threatened minority shareholder oppression claims.
- Represented an accountant as individual witness in front of the SEC and DOJ as part of a government investigation into insider trading at a Fortune 500 company.
- Represented the Audit Committee of a Nasdaq-traded consumer goods and financing company in an independent investigation.
- Represented 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. BUCF, handling asset seizures and liquidation, investor claims and distributions, and third-party litigation to maximize the value of the Receivership 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.
Antitrust
- Represented health system in defense of anticompetitive claims and allegations.
- Represented a putative class of independent retailers of higher education course materials in an antitrust suit against publishers and other retailers.
- Represented a manufacturer in direct and indirect purchaser putative class actions regarding an alleged conspiracy to fix prices.
- Represented a manufacturer in an adjudicatory proceeding before the Federal Trade Commission involving price-fixing allegations.
- Advised numerous companies regarding antitrust policy and compliance matters.
Advertising and Social Media
- Representing food manufacturing company in defense of putative class action regarding origin and other false advertising claims.
- Representing food manufacturing company in regulatory proceedings related to advertising claims of competitors.
- Representing consumer services provider in litigation related to advertising claims of competitors.
Professional
- American Bar Association, Vice Chair, Civil Practice and Procedure Committee, 2022-2023
- American Health Law Association, Health Care Liability and Litigation Practice Group, Vice Chair – Educational Programming, 2021-Present
- Antitrust & Business Litigation Council, State Bar of Texas, 2020-2022
- Dallas Bar Association’s Women Empowered to Lead in the Legal Profession, 2020
- Federal Bar Association – Dallas Chapter President, 2017-2018, President-Elect, 2016-2017, Vice President, 2015-2016, Secretary, 2014-2015
- Dallas Association of Young Lawyers, Co-Chair, Ask-A-Lawyer Committee, 2013-2016, Freedom Run Committee, 2013-2016, DAYL Leadership Committee, 2014
- Texas Association of Defense Counsel, Young Lawyer Committee
- Dallas Bar Association
- DRI, Voice of the Defense Bar
- Women’s Energy Network
Community
- Cattle Baron’s Ball for the American Cancer Society, Live Auction Chair (’24), Treasurer (’23), Assistant Underwriting Chair (’22), Raffle Chair (’21), 2018-2021
- Heroes for Children, Heroes and Handbags Host Committee, 2017
- Make-A-Wish Foundation, Dallas Area Regional Advisory Council, Founding Member, Young Leaders Council, Chair, Walk for Wishes, 2016
- Ones to Watch, The Best Lawyers in America© by Woodward/White Inc. (Antitrust Law Commercial Litigation, Health Care Law), 2021-2024
- 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, 2019-2020
- Best Lawyers Under 40 in Dallas by D Magazine, 2020-2022
- Texas Super Lawyers® by Thomson Reuters, 2022-2023
- Best Lawyers in Dallas by D Magazine, 2023
- Quoted, “Number of uninsured could rise under Biden’s proposed three-month limit to short-term plans”
Healthcare Finance News, September 21, 2023 - “2021 Rule Changes: Texas Rules of Civil Procedure”
Dallas Bar Association Headnotes, July 2021 - Co-author “Innovative Health Care: A Look at Coverage and Litigation”
American Health Law Association’s PG Briefing, April 28, 2021 - Co-author, “Billing for Advanced Practitioner Professionals and Traps for the Unwary”
Journal of Health and Life Sciences Law, March 29, 2021 - “Direction for Directors Post-Marchand: An Overview of Director Liability and Exposure”
The Texas Lawbook, August 2020 - “The Doctor Will (Virtually) See You Now”
D Magazine, July 2020 - “Supreme Court Permits SEC Disgorgement of Net Profits, in Liu v. SEC”
Client alert, June 2020 - “Recent State and Federal Legislation Regarding ‘Surprise Billing’ “
American Health Lawyers Association’s PG Briefing, January 2020 - “SCOTX Erects New Hurdle for Litigating Anonymous Defamation”
The Texas Lawbook, February 2019
- “8 Ways Healthcare Providers Can Smooth the DRG Audit Process”
Healthcare Financial Management Association, February 2022 - “Issues Related to Post-Payment DRG Audits”
American Health Lawyers Association, October 2021 - “Strategies to Mitigate Director Liability and Exposure in 2021 and Beyond”
American Health Lawyers Association, February 2022 - “Strategies to Mitigate Director Liability and Exposure in 2021 and Beyond”
Association of Corporate Counsel Dallas-Fort Worth, September 2021 - “Consumer Protection Update”
ABA Antitrust Law Section, June 2021 - “Direction for Directors Post-Marchand“
National Association of Corporate Directors, September 2020 - “A Guide for Directors to Avoid Fiduciary Liability”
June 2020 - “Consumer Protection Update”
ABA Antitrust Law Section, June 2019 - “Fraud & SEC Updates”
North American Petroleum Accounting Conference, May 2019
I am an avid hunter, specifically elk and deer. I am a mom of three. I practice yoga multiple times per week, and I love to hike, particularly at my family’s ranch in Montana. I also love to cook and play the piano.