About John Marshall
John Marshall Creagar studied history at Kansas State University before turning to law. He earned a B.S. in History and later attended the University of Missouri–Kansas City, where he completed his J.D. in 2014. Those academic years set the stage for a practice centered in Missouri.
He entered the legal field soon after law school. His early practice included work at The Law Offices of Creagar and Thurmond, LLC in 2015. By 2018 he was listed as a lawyer at Creagar Law, LLC. The timeline suggests a steady progression from a partnership-style office to operating under his own firm name, with responsibilities that typically fall to small-firm practitioners: client counseling, courtroom appearances, and case management.
Creagar holds certification as a Guardian ad Litem in Missouri. That credential places him in roles where he represents the interests of children or other vulnerable parties in family and juvenile court settings. He is admitted to practice in Missouri, and his work has involved matters arising under state law. His experience at two separate legal entities has given him familiarity with both collaborative and solo practice environments, and he has handled procedural and evidentiary issues that commonly arise in family and juvenile cases.
Colleagues describe the practical side of his practice: courtroom preparation, witness interviews, and drafting pleadings. Those are routine tasks for many litigators, but they are central to how cases move forward in individual custody or guardianship matters. Creagar’s background in history is evident in the way he approaches factual development, often tracing timelines and contextual details before building legal arguments.
Today he continues to practice law in Missouri. His professional path includes work at The Law Offices of Creagar and Thurmond, LLC and Creagar Law, LLC, and he serves as a certified Guardian ad Litem. He practices in Missouri and handles matters that commonly arise in family and juvenile court proceedings.
