Matthew A. Costello

Matthew A. Costello is an associate attorney at Nilles Law Firm in Fargo, North Dakota whose practice is part of the firm’s litigation group and includes business and corporate, business litigation, commercial and contracts, construction, debtor-creditor, insurance, and landlord-tenant matters. Costello works with businesses and individuals on research, written advocacy, motion practice, and dispute preparation. The practice is grounded in the specific legal and business issues reflected in those matters, with attention to the governing law, the client’s objectives, and the practical steps required to move a matter forward.

Costello’s education includes a J.D. from the University of North Dakota School of Law in 2023 and a B.S. from Minnesota State University Moorhead in 2019. The firm narrative describes the undergraduate program as a Bachelor of Science in Paralegal. During law school, he served as a legislative intern for the North Dakota Senate Finance and Taxation Committee and Transportation Committee. This background supports careful legal analysis, research, writing, and problem solving in the matters handled in practice. It also provides context for evaluating legal risk, explaining available options, and connecting technical rules to the real-world decisions clients need to make.

Costello’s experience includes working in the firm’s litigation group and handling research, analysis, written advocacy, and other tasks connected to civil disputes. Costello also worked as a Legal Research, Writing, and Analysis Tutor at Minnesota State University Moorhead from 2018 to 2019. These matters have involved North Dakota civil litigation, court filings, motion practice, and dispute preparation.

Matthew A. Costello has also been recognized for membership in the State Bar Association of North Dakota Young Lawyers Section and admission to the U.S. District Court for the District of North Dakota. Through his early-career combination of litigation work, legislative experience, and legal research training, Costello remains engaged with the professional and practical issues that affect this area of law. Clients benefit from advice that is tied to the facts of the matter, the applicable legal framework, and the business or personal considerations that influence how a legal issue should be addressed.

Law Office Affiliations

• Attorney, Nilles Lawyers
• Member, State Bar Association of North Dakota
• Member, State Bar Association of North Dakota – Young Lawyers Section

Licensed State

• North Dakota

Education

• University of North Dakota School of Law
  Juris Doctor (JD)
• Minnesota State University Moorhead
  Bachelor of Science (BS)

Awards & Badges