Licensed in Missouri & Illinois. Compassionate mediation. Fierce advocacy when it matters.
Mary C. Neff has spent her career helping families in the St. Louis metro area and Monroe County, Illinois navigate some of life's hardest moments: divorce, custody disputes, and everything in between. With advanced degrees in both law and family sciences, and dual licensure in Missouri and Illinois, Mary brings a rare combination of legal experience and genuine human understanding to every case.
Born and raised in Monroe County, Mary knows these communities well. After earning her J.D. from Saint Louis University School of Law and a Master's in Family Sciences, she built her reputation as a dual-licensed attorney, Supreme Court-certified mediator in Missouri and Illinois, and court-recognized Guardian ad Litem in Illinois.
Meet Mary C. NeffFamily law representation and mediation services for clients in Missouri and Illinois.
Strategic representation for contested and uncontested divorce in Missouri and Illinois.
Learn moreHelping parties work toward mutually acceptable agreements outside the courtroom.
Learn moreProtecting your children's best interests, guided by a Master's in Family Sciences.
Learn moreCourt-appointed child advocacy in Illinois courts, focused entirely on the best interests of the child.
Learn morePractical guidance from a dual-licensed family law attorney.
June 1, 2026
Navigating a divorce in Illinois can feel overwhelming. Here's what the process actually looks like, step by step.
Read article →June 8, 2026
If you or your spouse lives on either side of the state line, understanding the differences matters.
Read article →June 18, 2026
Mediation can work well beyond amicable splits, even when things are complicated.
Read article →Schedule a free consultation with Mary and get clear on your options. No obligation, no pressure.
Schedule Your Free ConsultationOr call: (618) 281-MARY (6279)