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Attorney, Gantenbein Law Firm




PHONE: 303-618-2122

FAX: 303-872-6649


Daniel Knudsen joins Gantenbein Law Firm as a highly experienced tax attorney. Daniel Knudsen has been practicing law in 14 states, with current pending Bar license applications in 2 other states. Daniel is also licensed in the United States Tax Court, the United States Court of Appeals for the Ninth Circuit, the United States District Court for the Western District of Oklahoma and the United States District Court for the District of Montana. Daniel received his LL.M in taxation, the highest degree in tax law possible, from Georgetown University in Washington, D.C.


Prior to joining Gantenbein Law Firm, Daniel held legal positions in both government entities and private corporations- including the Washington State Department of Revenue, the Department of Administration for the State of Montana, Oklahoma Indian Legal Services, his own law firm and a private law firm in New York City. In these positions, Daniel was a strong advocate for his clients in complicated Federal IRS, State and Local taxation matters- including tax issues related to corporate tax law, real estate tax law, tribal law, debt negotiation, tax audits, and tax issues as they related to estate and trust matters. 


Daniel's versatile legal acumen also includes Tribal Law, Real Estate Matters, Business Law, Contract Law, Government and Regulatory Matters and Litigation.

In addition to Counsel for Gantenbein Law Firm, Daniel is also highly experienced in tribal law and remains the current General Counsel for his tribe. 

We are very excited to have such a highly-respected, experienced and well-rounded attorney join Gantenbein Law Firm's legal team. 

  • Georgetown University Law Center, LL.M, Taxation, Washington, D.C.;

  • Georgetown University Law Center, Certificate, State and Local Taxation, Washington, D.C.; 

  • Georgetown University Law Center, Certificate, International Taxation, Washington, D.C.;

  • Purdue University, B.S. in Acct., West Lafayette, IN;​

  • Villanova University Charles A. Widger School of Law, Certificate, Tax Litigation and Procedure, Villanova, PA;

  • University of Montana School of Law, J.D., Missoula, MT;

  • University of Montana School of Law, Certificate, Environmental Law, Missoula, MT ;

  • University of Montana School of Law, Certificate, American Indian Law, Missoula, MT ;

  • University of Montana, M.S. in Public Administration, Missoula, MT; 

  • Montana State University Billings, M.S. Public Communications, Billings, MT;

  • Montana State University Billings, B.S. Public Relations, Billings, MT.

  • California Bar (pending); 

  • Colorado Bar;

  • District of Columbia Bar;

  • Illinois Bar;​

  • Minnesota Bar;

  • Montana Bar;

  • New York Bar;

  • North Carolina Bar;

  • North Dakota Bar;

  • Oklahoma Bar (pending);

  • South Carolina Bar;

  • South Dakota Bar;

  • Texas Bar;

  • Utah Bar;

  • Washington Bar;

  • Wyoming Bar.

  • U.S. Tax Court

  • U.S. Court of Appeals for the Ninth Circuit

  • U.S. District Court for the Western District of Oklahoma;

  • U.S. District Court for the District of Montana;

  • Tribal Liaison, Washington State Department of Revenue. Olympia, WA: Assisted the Department in developing and implementing state and agency policies that promote effective communications and collaboration between the Department and tribal governments; liaison with tribal governments and other external stakeholders and maintain communication between parties; coordination of training of state agency employees in government-to-government relations and advise tribal governments and external stakeholders on Washington state tax law.

  • Special Counsel, Falcon, Rappaport & Berkman, PLLC. New York, NY: Tax advice and written tax opinions to clients addressing a diverse range of sophisticated tax, trust, estate and corporate law matters; representation of clients in international, domestic, federal, state and local tax matters. 

  • Attorney, State of Montana, Department of Administration. Missoula, MT: First chair litigation representation in state court civil matters; mediation, arbitritration; discovery; settlement negotiations; adjudicatory hearings.

  • Attorney, Knudsen Law Firm, PLLC. Kalispell, MT: General Counsel to multiple businesses owned by a federally-recognized Native American tribal government, including a well-resourced non-profit foundation; Business, Employment, Real Estate, Contract, Tax, Transaction, Government, Regulatory and Educational legal advice and counsel to stakeholders.


  • Tax Attorney, Oklahoma Indian Legal Services, Inc., Oklahoma City, OK: Tax law counsel to 39 tribal governments in Oklahoma, their members, and Oklahoma citizens; ABA Section of Taxation Christine A. Brunswick Fellow; taught CLE sessions to Section members; represented hundreds of individual taxpayers before the IRS; conducted tax law eduction and outreach throughout Oklahoma.

  • United Nations International Tax and Development Cooperation Branch, Economic Affairs Intern, 2020;

  • American Bar Association, Business Law Section, Fellow, 2015-2018;

  • Missoula County Board of County Commissioners, Legislative Intern, 2014-2015;

  • California Superior Court County of Orange Complex Civil Court, Law Clerk, 2014;

  • U.S. District Court for the Northern District of Texas Dallas Division, Law Clerk, 2013; 

  • U.S. Department of Health and Human Services Missoula Indian Center, Deputy Director of Human Resources, 2012;

  • U.S. Department of Health and Human Services, Assistant, 2011;

  • U.S.Mark E. Udall, Intern, 2011;

  • 112th Congress U.S. Senate, Native American Congressional Fellow, 2011.

  • Knudsen, D.P. (2020). Federal Taxation of Cannabis, Marijuana Venture, 7(9), 120-122.

  • Friedlander, J.P, Knudsen, D.P., & Rappaport, M.E. (2020). Non-Qualified Deferred Compensation as an Employee Retention Tool.

  • Member, National Association of Certified Mediators;

  • Certified Federal Grant Manager.

  • Psi Sigma Alpha Epsilon Mu Chapter;

  • Phi Delta Phi Clayburgh Inn.

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