Mackenzie is an experienced trial attorney representing health care entities, businesses, and directors in high-stakes litigation. Hospitals and health care providers turn to Mackenzie for representation 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.

Corporations, business owners, and directors use Mackenzie's nuanced counsel for shareholder and securities litigation, corporate and shareholder rights, director and officer litigation, and merger 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 numerous companies regarding antitrust policy and compliance matters, and represented retailers and manufacturers facing antitrust suits.

She also handles cybersecurity policy and litigation, and develops and enforces privacy and data security policies.