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Leslie Gardner Mason
Leslie Gardner Mason
Senior Associate — Complex Commercial Litigation
Senior Associate — Complex Commercial Litigation

Leslie Gardner Mason

Leslie Gardner Mason

200 West 6th Street
Suite 2500
Austin, Texas 78701

Leslie Gardner Mason

Experience Highlights

  • (Tex.) – Obtained 8-0 ruling that local taxing unit did not have statutory authority to retain private attorney on contingent fee to pursue a taxpayer for an alleged $60 million in unpaid property taxes

  • (AAA/ICDR Arbitration) — Successfully defended Australian energy company against numerous contract and tort claims by holder of contractually reserved revenue interest relating to gas production from Australian oil and gas field and obtained award of attorney’s fees and costs

  • (AAA Arbitration and Tex. Dist. – Pecos County) — Represented an oil and gas production and exploration company in disputes in state court and arbitration proceedings implicating issues related to royalty payments, lease terminations, and surface restoration obligations concerning property in West Texas

  • (AAA Arbitration) — Represented an Eagle Ford Shale non-operator in pursuing breach of fiduciary duty, breach of agency and other contract claims against operator relating to operator’s decision to amend gas gathering contract with affiliate prior to sale of midstream assets 

  • (S.D. Tex. Bankruptcy) – Represented oil and gas operator in a complex contractual dispute under a joint development agreement and joint operating agreement over operatorship of over 300,000 acres and 1,800 wells in South Texas; secured complete victory for client after six-day trial in bankruptcy court

  • (Tex.) – Obtained unanimous ruling that Kinder Morgan timely filed a motion to dismiss under the Texas Citizens Participation Act


  • The University of Texas School of Law, J.D. with honors, 2016
  • Butler University, B.A. 2011
  • Judicial clerk to The Honorable Brett Busby, Texas Court of Appeals, Fourteenth District, 2016-2017
  • The Best Lawyers in America© (BL Rankings, LLC), “Ones to Watch,” Commercial Litigation (Houston), 2023 and 2024
  • Member: Institute for Energy Law
  • Member: Austin Bar Foundation
  • Member: Federal Bar Association
  • Fellow: Texas Bar Foundation
  • Texas
  • U.S. District Court for the Southern District of Texas