James Joseph Leightner
James J. Leightner • Clayton, MO
Divorce SeparationEstate PlanningTax
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Contact
Email
Phone
(866) 580-4566
Address
Suite 600, Clayton, MO, 63105, US
Professional
About
James Joseph Leightner is a distinguished partner and co-founder of the Law Offices of Diekman & Leightner, located in the heart of Clayton, MO. With a Bachelor of Arts in Economics from the University of Missouri-Columbia, earned in 1983, and a Juris Doctor from St. Louis University School of Law, obtained in 1986, James combines a solid educational foundation with over 30 years of legal experience. A proud alumnus of Chaminade High School, he has deep roots in the St. Louis community, where he has lived his entire life. James specializes in family law, focusing on divorce and legal separation, child custody, child support, paternity, and domestic partnerships. His empathetic approach to family law allows him to understand the emotional complexities his clients face, enabling him to provide tailored legal strategies that prioritize their best interests. Beyond family law, he is well-versed in business and corporate law, tax issues, and estate planning, ensuring a comprehensive service for a diverse clientele. Throughout his extensive career, James has built a reputation for fiercely advocating for his clients. He believes that an assertive and proactive approach is essential in navigating the complexities of the legal landscape, whether through negotiation or in the courtroom. His commitment to obtaining optimal resolutions has earned him the trust and respect of clients and peers alike. Licensed to practice in all Missouri State Courts, as well as the Federal District Court for the Eastern District of Missouri, the U.S. Court of Appeals for the Eighth Circuit, and the United States Tax Court, James Leightner is committed to delivering thorough legal analysis and representation. His passion for law and dedication to his clients position him as a leading advocate in family law and beyond, making him an invaluable resource for anyone seeking legal assistance in Clayton and the surrounding areas.
About Divorce Separation Law
Divorce attorneys guide couples through the legal process of ending their marriage. They handle property division, custody, support, and other divorce-related matters. Common matters include contested divorce, uncontested divorce, property division, alimony.
Credentials
Education
1986 Saint Louis University School of Law J.D. 1983 University of Missouri, Columbia BA - Bachelor of Arts
Recognition & Involvement
Associations
2015 - Present Bar Association of Metropolitan St. Louis 2012 - Present St. Louis County Bar Association Member
Other Divorce Separation Attorneys in Clayton, MO
Updated: Jun 09, 2026