D. Wiley Barker

D. Wiley Barker: Attorney with Crowley Fleck PLLP
  • Partner at Crowley Fleck PLLP (165 Attorneys)
  • 900 N. Last Chance Gulch, Suite 200, Helena, MT 59601
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Wiley Barker is a Partner in the Helena, Montana office. His practice includes state and local taxation, regulatory law, and insurance law. He is focused on helping businesses and individuals obtain fair tax treatment, helping regulated entities navigate various state regulatory issues, and assisting insurance companies in evaluating and litigating coverage issues. He regularly advises clients regarding these areas of law, and litigates disputes when necessary. He represents clients before various administrative agencies, as well as trial-level and appeals courts. Wiley is licensed in Montana, North Dakota, and Wyoming.

Honors & Awards

2016 First Judicial Bar Association Pro Bono Award

Presentations & Publications

“The Absurd Results Doctrine, Chevron, and Climate Change” Brigham Young University Journal of Public Law, Vol. 26, No. 1, pp. 73-98
Extraction and Expansion, Montana’s Approach to Taxes on the Energy Industry Presentation
Montana Chamber of Commerce Tax Presentation
Essential Facts about Montana Tax, BETTR Section Presentation

Areas of Practice (14)

  • Business Organizations
  • Tax
  • Oil and Gas
  • Lobbying, Regulatory and Administrative Affairs
  • Lobbying
  • Regulatory and Administrative Affairs
  • Taxation
  • Natural Resource and Energy Taxes
  • State and Local Taxes
  • Tax Audits and Controversies
  • Tort Litigation
  • Coverage decisions
  • Medical Malpractice Defense
  • Payment of insurance benefits

Education & Credentials

Contact Information:
(406) 449-4165  Phone
Mailing Address:
P.O. Box 797, Helena, MT 59601
University Attended:
Utah State University, B.A., Accounting
Law School Attended:
Brigham Young University School of Law, J.D., Magna Cum Laude, 2011; B.A. in Economics, Summa Cum Laude, 2007
Year of First Admission:
U.S. District Court, District of Montana; 2011, Montana; 2012, North Dakota; 2012, Wyoming

Professional Affiliations

Montana State Bar
North Dakota State Bar
Wyoming State Bar

Reported Cases:
Reported Decisions / Cases: Department of Revenue v. Heidecker, 2013 MT 171, 370 Mont. 464, 304 P.3d 726; Plains Marketing, LP v. Mountrail County Board of County Commissioners, 2016 ND 100, 879 N.W.2d 75

Peer Reviews

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Lex Mundi

Helena, Montana

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