D. Wiley Barker

Firm: Crowley Fleck Law
Location: Helena - MT

  • 900 N Last Chance Gulch #200
    Helena, MT 59601
  • Tel : (406) 449-4165
  • Fax : (406) 449-5149

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.

Bar Admission

Montana, 2011
U.S. District Court, District of Montana
North Dakota, 2012
Wyoming, 2012


2011 – J.D., Magna Cum Laude, Brigham Young University School of Law
2007 – B.A. in Accounting, B.A. in Economics, Summa Cum Laude, Utah State University

Honors & Awards

2016 First Judicial Bar Association Pro Bono Award

Professional Affiliations

Montana State Bar
North Dakota State Bar
Wyoming State Bar

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

Crowley Fleck Law

Crowley Fleck PLLP is one of the oldest and largest law firms in our region. Our law firm counts over 160 attorneys practicing in the areas of commercial litigation, insurance defense litigation, natural resources, mining and energy law, healthcare, commercial transactions, banking and finance, creditors rights, real estate transactions and development, tax and estate planning and administration, intellectual property matters, employment law, and governmental affairs and lobbying.

Our law firm has offices throughout Montana, North Dakota, and Wyoming, including offices in Billings, Bozeman, Butte, Helena, Kalispell, and Missoula, Montana; Bismarck and Williston, North Dakota; and Casper, Cheyenne, and Sheridan, Wyoming.

The law firm traces its beginning to 1895, when W. M. Johnston established his law practice in an office across from the Northern Pacific Depot in Billings, Montana. As its reputation grew over the ensuing decades, so did the firm. The firm began by serving the legal needs of a wide variety of clients, from local families to small business owners, from family farmers and ranchers to local lending institutions, from local hospitals and physician groups to energy pioneers, power generators, and mining interests. We continue to serve the same clients today, joined by national and international businesses representing virtually every industry with interests in our region. To better serve the increasingly diverse and complex needs of our clients, the firm established offices in Helena, Montana (1991), Kalispell, Montana (1997), Bozeman, Montana (2000), Missoula, Montana (2003), Butte, Montana (2011), and in Williston, North Dakota (1996).

Crowley Fleck PLLP is the exclusive member firm in Montana for Lex Mundi – the world’s leading network of independent law firms with in-depth experience in 100+ countries worldwide.