About John C.
John C. Schleiffarth built his legal foundation in two distinct classrooms. He earned a Bachelor of Arts from Brigham Young University in 2005, concentrating on international law and diplomacy. He then attended Barry University Dwayne O. Andreas School of Law and received his Juris Doctor in 2010.
While in law school, Schleiffarth gained early courtroom exposure. In 2008 he clerked at Fisher and Frommer, PLLC, where he assisted on motion practice and case preparation. Those years shaped how he approaches evidence and procedure now.
After law school he launched a practice of his own. Since 2010 he has served as principal lawyer at firms operating under his name, including JCS Law — John C. Schleiffarth, P.C., and The Law Office of John C. Schleiffarth, P.C. His office handles cases in state and federal forums. He is admitted to practice in Missouri and before the U.S. District Court for the Eastern District of Missouri.
Schleiffarth’s work centers on criminal defense matters, and he is active in communities that reflect that interest. He has held memberships in the National Association of Criminal Defense Lawyers and the Missouri Association of Criminal Defense Lawyers since 2012. He is also part of the National College for DUI/DWI Defense. In 2014 he was named a "10 Best" recipient by the American Institute of DUI/DWI Lawyers, an honor he continues to hold.
Professional groups supply both training and peers. Schleiffarth belongs to the Federal Bar Association and the National Trial Lawyers Association. He has been involved with the J. Ruben Clark Law Society since 2010. Those memberships inform his practice and keep him current on trial technique, sentencing developments, and evidentiary trends.
In court he emphasizes preparation. He aims to test evidence early and to challenge weaknesses before trial. He handles DUI and other state-level criminal cases, and he accepts matters that require representation in federal court. His record shows steady engagement in litigation and motions work rather than transactional or corporate practice.
Clients seeking counsel will find an attorney who has moved from law clerk to principal lawyer and who continues to work in Missouri courts. He maintains a practice handling criminal defense, including DUI/DWI matters and federal cases in the Eastern District of Missouri.
