About Ann
Ann Leone trained at The John Marshall Law School, where she completed her Juris Doctor in 2015. She arrived at law school after practical experiences that led her into public service. Her academic record placed her on a path toward courtroom work and legal advocacy.
Early in her career, Leone served as a law clerk in 2013 at The Office of the Public Guardian. That clerkship exposed her to the procedural side of guardianship and the day-to-day demands of representing vulnerable people. The position gave her courtroom exposure and an understanding of litigation management long before she finished law school.
After earning her J.D., Leone expanded her practice credentials. She is admitted to the Illinois bar and holds admission to several federal appellate circuits, including the 1st, 2nd, 3rd, 4th and 5th Circuits. Those admissions reflect repeated appearances or filings at the appellate level and an ability to take cases beyond state courts.
Leone has held membership in professional legal organizations and remains active in bar-related circles. Colleagues describe her as steady and procedural-minded. She tends to favor careful record review and tight briefing. Those traits have shaped how she approaches disputes and client counseling.
She is a principal at Leone & Kosyla Law, LLC. At the firm she has handled matters that require coordination across state and federal venues. The office roster lists a mix of litigation and appellate work, and she shares responsibility for client intake, drafting briefs and courtroom advocacy.
Leone’s work ethic reflects the arc of her training: classroom study followed by public-sector experience and then private practice. She keeps a practical view of litigation risks and settlement options. Her approach is methodical. She emphasizes thorough preparation and attention to procedural detail.
Clients and other lawyers see her as the kind of attorney who prepares for hearings and manages appellate submissions carefully. She continues to maintain professional ties in Illinois and among the circuits where she is authorized to appear. Her current practice focuses on representing clients in matters in Illinois and in federal appellate courts.
