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Erin Willadsen

Erin Willadsen is a Sioux Falls, SD native. Erin graduated from the University of Nebraska-Lincoln in May 2016 with a Bachelor of Science in Business Administration. Following graduation, she returned to South Dakota to attend the University of South Dakota School of Law, graduating in May 2019 with Sterling Honors. During her law school career, Erin served as the President of the Moot Court Board and Vice President of the Trial Team. Erin and her teammates advanced to become quarterfinalists at the Leroy R. Hanssell, Sr. National Constitutional Law Moot Court Competition in Virginia Beach, VA, and semifinalists at The National Criminal Justice Trial Competition in Chicago, IL.

Erin started with the firm as a runner following her graduation from high school in 2012. Erin continued to work for the firm as a runner during her college summers. Following her first year of law school, Erin returned as a legal intern. She joined the firm as a full-time associate in August 2019. She works closely with Clint Sargent and Raleigh Hansman. Erin’s present practice includes civil litigation and criminal defense.



University of Nebraska- Lincoln, 2016  
      Business Administration; Minors in Mathematics and Political Science

University of South Dakota School of Law, 2019 
       Sterling Honors


South Dakota
United States District Court, District of South Dakota

United States Court of Appeal for the Eighth Circuit


State Bar of South Dakota
–  Women in Law 2019 – Present

South Dakota Trial Lawyers Association
–  Board of Governors 2020 – Present
Second Circuit Bar Association
– President, 2023 
2nd Circuit Board, 2021 – Present
–  2nd Circuit Women in Law


USD School of Law Trial Team Inaugural Thomas J. Horton Advocate of Excellence Award-2019
USD School of Law- Dean’s Leadership Award- 2019


Sioux Empire United Way Campaign Volunteer
Teen Court Volunteer

Jury Trials

State v. Falkenberg, (Yankton Co. 2020)
Murder – 2nd Degree

State v. Brumbaugh, (Gregory Co. 2021)
      Simple Assault (Domestic) 

State v. Schwartz, (McCook Co. 2021)
      Simple Assault

State v. Jones, (McPherson Co. 2023)
      Theft by Embezzlement

Court Trials

State v. Prostrollo, (Minnehaha Co. 2020)
Aggravated Assault Against Law Enforcement Officer

State v. Nichols, (Minehahaha Co. 2023)
Aggravated Assault- Insanity