About

Mary O’Neill is an attorney with Jones Day in Chicago, Illinois, where she advises clients across a broad range of legal matters in the firm’s General Practice. Based in downtown Chicago, Mary brings a thoughtful, client-focused approach to her work, helping individuals and businesses navigate complex legal issues with clarity, professionalism, and attention to detail. Her practice reflects the versatility and responsiveness that clients value in a trusted general practice attorney. With a strong commitment to practical problem-solving, Mary works to understand each client’s goals and deliver guidance tailored to their unique circumstances. She is dedicated to providing clear communication and diligent representation, recognizing that effective legal counsel requires both legal skill and a responsive approach to client service. Whether addressing day-to-day legal concerns or helping clients manage more complex matters, Mary strives to provide dependable support throughout every stage of the representation. Mary is admitted to practice in Illinois, bar number 4376778. From Jones Day’s Chicago office, she contributes to the firm’s longstanding reputation for high-level legal service while maintaining a client-centered perspective. Her practice is grounded in professionalism, integrity, and a commitment to helping clients move forward with confidence.

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