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Mark Banner Mark Banner

Mark Banner

Shareholder & Director

Mark Banner has been with Hall Estill for more than 35 years and is a Senior Member of the firm's Board of Directors. He represents clients in a wide range of disputes and litigation matters, with a focus on oil and gas law. Mark represents oil and gas producers, mid-stream companies and interstate pipelines in litigation involving all facets of the oil and gas industry, including lease and contract disputes, tort claims and land use issues. In 2019, Mark won a judgment for his client in an oilfield pollution case tried in Northern Wyoming: Windsor Jepson, LLC v. Whiting Petroleum Corporation, No. CV 2014-0079, Fourth Judicial District, Wyoming.

Mark also represents clients in class action litigation. He has successfully defeated class action certification in a variety of cases in Oklahoma, Arkansas and Kansas, including:

  • Riedel v. XTO Energy Inc., 257 F.R.D. 494 (E.D. Ark. 2009)
  • Foster v. Apache Corporation, 285 F.R.D. 632 (W.D. Okla. 2012)
  • Ginardi v. Frontier Gas Services, LLC, 2012 WL 1377052 (E.D. Ark.)
  • Roderick v. XTO Energy Inc., 2013 WL 3389469 (C.A. 10 (Kan.) )
  • Chieftain v. XTO Energy Inc., 2013 WL 3388629 (C.A. 10 (Okla.) )
  • Roderick v. XTO Energy, Inc., 2016 WL 10520112 (D. Kan.)
  • Whisenant v. Strat Land Exploration Co., 2018 OK CIV APP 65

Mark, who has an individual AV Preeminent rating through Martindale-Hubbell, also represents pipeline companies in easement acquisition and eminent domain proceedings. He has been lead counsel in several Oklahoma and multi-state pipeline projects, including serving as Oklahoma counsel for the TransCanada Keystone and Cushing Connect pipeline projects. Further, he has experience assisting clients with the Telephone Consumer Protection Act (TCPA).  


  • Georgetown University Law Center (J.D., cum laude, 1988)
  • University of Oklahoma (B.A. in Psychology, 1983)


  • Oklahoma (1988)
  • Oklahoma Supreme Court
  • U.S. District Court for the Eastern, Northern and Western Districts of Oklahoma
  • U.S. District Court for the Eastern District of Arkansas
  • United States Court of Appeals for the Tenth Circuit
  • 1988 - Present Hall Estill
  • 1987 - 1988 Department of Justice (law clerk)
  • 1986 - 1987 Federal Energy Regulatory Commission (law clerk)
  • Member, Board of Directors, American Red Cross
  • Leadership Tulsa, Class XXIV
  • Philbrook Museum of Art
  • Past Board Member, Ronald McDonald House
  • Oklahoma Bar Association
  • Tulsa County Bar Association, Mineral Law Section (past President)
  • American Inns of Court, Johnson Songtag/Council Oak Chapter (past President)
  • Adjunct Settlement Judge, Northern District of Oklahoma (1998-present)
  • Member, Petroleum Alliance of Oklahoma
  • Recognized as Best Lawyers' Tulsa Lawyer of the Year in Energy Law in 2022
  • Recognized as a Best Lawyer in America in Commercial Litigation and Energy Law
  • Recognized as an Oklahoma Super Lawyer in Class Actions/Mass Torts
  • Recognized as a Local Litigation Star by Benchmark Litigation
  • Recognized as an Up and Coming attorney in Energy & Natural Resources Law by Chambers USA