Derek A. Nelsen | Sioux Falls Insurance Lawyer

Mr. Derek A. Nelsen

Mr. Derek A. Nelsen

Insurance, Bad Faith Insurance, Commercial Insurance, Personal Injury, Litigation, Mediation, Appellate Practice, Civil Litigation, Property Law

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Language(s): English

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Main Office

7521 S Louise Ave
Sioux Falls, SD 57108

Office Hours

Monday - Friday9:00 AM - 5:00 PM

Other Locations

Proudly serving Sioux Falls, South Dakota, and the surrounding areas.

Fuller, Williamson, Nelsen & Preheim

About Derek

Derek graduated with distinction from the University of Nebraska, Lincoln, in 2006. He received his Juris Doctorate from the University of South Dakota School of Law in 2009. As a testament to his writing and oral advocacy skills, Derek was the only person to simultaneously be a Law Review Editor and Moot Court Board Member during law school. In addition to his accomplishments outside of the classroom, Derek graduated from law school as a Sterling Honor Graduate and was the recipient of the Law School’s prestigious Gavel Award.

After graduating, Derek clerked for the Honorable Justice Judith Meierhenry of the South Dakota Supreme Court from 2009 until 2011. As a law clerk, Derek reviewed over 1,000 appellate briefs, heard approximately 100 oral arguments, and assisted the South Dakota Supreme Court in writing its decisions. He joined the firm after his clerkship ended.

Since joining the firm, Derek has developed a comprehensive litigation practice with a focus on insurance-based and insurance bad faith cases. Derek has tried jury trials across South Dakota, given oral arguments before the South Dakota Supreme Court, and has appeared regularly in South Dakota’s Federal Courts. Derek’s advocacy skills have earned him a reputation for excellence, which has resulted in his retention by other attorneys to assist with high-value and high-stakes cases at trial and on appeal. Derek is admitted to practice in South Dakota, Minnesota, the Eighth Circuit Court of Appeals, as well as the Flandreau Santee Sioux Tribal Court. Derek is a member of the American Bar Association, South Dakota Defense Lawyers Association, South Dakota Trial Lawyers Association, Second Judicial Circuit Bar Association, and Defense Research Institute. Derek is AV-Preeminent rated for high professional ethics and legal abilities.

Please call today to further discuss my fee structure.

Experience

Partner

Fuller, Williamson, Nelsen & Preheim, LLP

2011-Present

Sioux Falls, South Dakota

Law Clerk

Honorable Justice Judith Meierhenry, South Dakota Supreme Court

2009-2011

Admission

Verified Minnesota

2011

Verified South Dakota

2010

Education

University of South Dakota School of Law

J.D.

2009

Recognitions & Achievements

Associations
  • Member | U.S. District Court, District of South Dakota
  • Member | American Bar Association
  • Member | Second Judicial Bar Association
  • Member | South Dakota Defense Lawyers Association
  • Member | South Dakota Trial Lawyers Association
  • Member | Phi Beta Kappa
Honors / Awards
  • Gavel Award University of South Dakota
    2009
  • Sterling Honor Graduate University of South Dakota
    2009

Fuller, Williamson, Nelsen & Preheim Highlights

Insurance, Litigation, Employment, Personal Injury, Government

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Premium Member Mr. Derek A. Nelsen has been a Premium Member since October 03, 2025.

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