Mary's practice concentrates on resolving federal and state tax controversies, and white collar crime such as securities, tax and bank fraud. She represents individuals, closely-held businesses, and large corporations in IRS audits, appeals, and litigation in the United States Tax Courts, Federal District Courts and United States Court of Federal Claims. Mary also represents taxpayers in disputes with the Texas Comptroller of Public Accounts and other state tax agencies. Mary represents individuals and entities in business disputes and lawsuits involving fraud, breach of contract, breach of fiduciary duty, deceptive trade practices act violations, non-compete violations, business torts, and other commercial disputes.
Mary was quoted in the article, "Texas Oil Driller Settles $618M IRS Dispute in Tax Court" by David Hansen in Law360 on January 19, 2018. She was also quoted in the article, "Self-Serving Concessions and Penalty Avoidance", in Tax Notes on March 26, 2012.