Casey L. Matthiesen



Casey’s past – adopted at birth and growing up on a rural family farm in southwestern Minnesota – is a prologue to her personal values and professional passions. She is the third enrolled member in the history of the Yankton Sioux Tribe to become an attorney. Today her law practice focuses on taking difficult cases and rewriting the odds for her clients in high stakes litigation. She is a zealous litigator who practices in a wide variety of cases, including business litigation disputes, personal injury and medical malpractice claims, and representing tribes across the country. 

The lessons Casey learned on the farm continue to guide her as a lawyer: tenacity, old-fashioned hard work, and most importantly, never giving up on a neighbor in need. Casey’s unique life experiences are an important asset to her clients because they guide her creative and unrelenting approach to difficult situations. She has experience at nearly every stage of litigation, including trial. 

Casey is actively involved in bar associations, non-profits and community service activities. She was recently elected to serve as President of the Minnesota American Indian Bar Association. She dedicates a large portion of her career to promoting justice and educating the public about legal issues affecting Native American people. Outside of her legal practice, Casey enjoys painting, golfing, and is a certified yoga sculpt instructor. 

Prior to Robins Kaplan, Casey worked as a law clerk for the Hennepin County Attorney’s Office and for a highly regarded lobbyist during a South Dakota Legislative Session. Her next steps took her to the doors of the British Parliament in London, where she worked for a Member of the House of Commons. Casey studied Art and Italian language at Florence University of the Arts in Italy and British Politics at the London School of Economics & Political Science.

  • Micek v. Mayo Clinic, No. 21-CV-0436, 2021 U.S. Dist. WL 5282755, at *1 (D. Minn. Nov. 12, 2021). Obtained favorable order denying defendant’s motion to dismiss in medical malpractice action.
  • Erickson v. Mayo Clinic Health System – Southeast Minnesota Region, et al., No. 27-CV-21-3324 (Minn. Fourth Jud. Dist. June 15, 2021). Represented plaintiff in a medical malpractice/wrongful death action, obtaining favorable order denying defendant’s demand for change of venue. 
  • Named a “North Star Lawyer” by the Minnesota State Bar Association for providing at least 50 hours of pro bono legal services (2021)
  • Hennepin County Bar Association – New Lawyers Section, Co-CLE Director
  • The Sanneh Foundation, Associate Board Member 
  • Twin Cities Diversity in Practice, Mentor
  • University of St. Thomas School of Law Mentor Externship Program, Mentor 
  • UPLIFT: Legal Institute for Teens, Volunteer Coach 
  • American Indian Community Housing Organization (AICHO), Volunteer
  • Minnesota Lawyers for the Arts (MnLA), Volunteer
  • Springboard for the Arts, Volunteer
  • Minnesota Indigenous Business Alliance, Volunteer
Bar Admissions
  • Minnesota
  • North Dakota
  • U.S. District Court, District of Minnesota
  • U.S. District Court, District of North Dakota
  • University of St. Thomas School of Law, J.D. (2020) 
  • University of South Dakota, B.A., magna cum laude (2017)
Professional Associations
  • Minnesota American Indian Bar Association, President and Board of Directors
  • Minnesota Coalition of Bar Associations of Color (MN-CBAC), Co-Chair
  • Federal Bar Association
  • Hennepin County Bar Association 
  • Minnesota Association for Justice
  • Minnesota State Bar Association
  • Minnesota Women Lawyers 
  • North Dakota Association for Justice
  • Twin Cities Diversity in Practice
  • American Association for Justice

  • Tribal Futures: How Can Public Policy Support Native American Economic Development?
    Mitchell Hamline School of Law Journal of Public Policy and Practice, Webinar (February 11, 2022)
  • Indian Arts and Crafts Acts for Attorneys
    Minnesota American Indian Bar Association CLE, Webinar (January 27, 2022)
  • Federal Bar Association Minnesota Chapter Annual Affinity Bar Meet & Greet 
    Federal Bar Association (January 13, 2022)
  • Celebrating Native American Heritage Month - Current Issues on American Indian Law and Policy 
    Hennepin County Bar Association, Webinar (November 29, 2021)
  • And Still We Rise: Rewriting the Odds with Casey Matthiesen
    University of St. Thomas (November 18, 2021)
  • Minnesota American Indian Bar Association Fall Feast 
    Minnesota American Indian Bar Association (November 11, 2021)
  • Current Issues on American Indian Law and Policy 
    Panelist, In-House CLE for a Financial Institution (October 12, 2021)
February 11, 2022
WEBINAR | Tribal Futures: How Can Public Policy Support Native American Economic Development?
Brendan Johnson, Casey Matthiesen - Mitchell Hamline School of Law
January 27, 2022
WEBINAR | Indian Arts and Crafts Acts for Attorneys
Springboard for the Arts
November 29, 2021
WEBINAR | Celebrating Native American Heritage Month
Tim Purdon, Brendan Johnson, Casey Matthiesen, Stacey Slaughter - Hennepin County Bar Association


Links to full publications and news releases.
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