About John Miller
John Miller Carroll has practiced law in Wisconsin for decades. He trained at Marquette University, where he completed his undergraduate degree, and then stayed on for law school, earning his J.D. from Marquette University Law School in 1987.
He launched his own practice the same year he graduated. Since 1987 he has been the lawyer and owner of John Miller Carroll Law Office, S. C. That choice anchored him in Milwaukee’s legal community and set the course for a solo practice that has operated continuously into 2026.
Carroll is admitted to practice in Wisconsin. He is also admitted to several federal forums, including the Seventh Circuit and the Eastern District of Wisconsin, and is admitted before the U.S. Supreme Court. Those admissions reflect the range of courts where he may file cases and petitions on behalf of clients.
Professional associations have been a steady part of his career. He holds membership in the Wisconsin Association of Criminal Defense Lawyers and is a member of the American Bar Association. He has kept active in those groups while running his office, attending events and staying current with practice developments.
Over the years his work has mixed courtroom appearances and written filings. Running a solo office required managing both the legal work and the business of a small law firm. He has handled procedural matters in federal and state courts, and pursued appellate filings where appropriate. He has balanced trial-level practice and the detailed preparation needed for higher-court submissions.
Clients who come to his office encounter a practice that has operated for more than three decades. The office remains small and client-centered in structure, which shapes how matters are handled and how legal services are delivered. The steadiness of that arrangement has allowed him to maintain continuity in his work and to appear regularly in the forums where he is admitted.
Today Carroll continues to operate his solo firm, handling litigation and filings in state and federal courts, including matters that proceed to the Seventh Circuit and filings before the U.S. Supreme Court as his admissions allow. He maintains an active practice in Wisconsin courts and federal venues.
