Leader of Washington DC Office Tax

Gary B. Wilcox

Tax, Tax Controversy & Litigation, International Tax & Transfer Pricing

"He is exceptionally knowledgeable about tax and has a really deep knowledge of the IRS."
Chambers USA 2022


Gary Wilcox is a partner in Mayer Brown's Washington DC office and a co-leader of the Tax Controversy & Litigation team. Previously, Gary served as a co-leader of PricewaterhouseCoopers' (PwC) US tax controversy practice, and led the tax practice at another international law firm. He also served as the deputy chief counsel of the US Internal Revenue Service (IRS), where he was in charge of approximately 700 attorneys in the Office of Chief Counsel and had primary responsibility within the IRS for developing its positions on technical tax issues and the issuance of regulations and rulings.


  • New York University School of Law, LLM in Taxation
  • University of Oklahoma College of Law, JD, with highest honors
  • Texas Tech University, BBA, cum laude, accounting


  • District of Columbia
  • Pennsylvania