About

William Charles O'Neil is a seasoned attorney based in Chicago, IL, with over two decades of experience at Winston & Strawn, LLP. Specializing in Commercial, Antitrust & Trade Law, Litigation, and General Practice, William has established himself as a formidable advocate in the legal community. His office, strategically located at 35 W Wacker Dr, serves as a hub for clients seeking expert legal counsel in complex business matters. Throughout his expansive career, William has demonstrated an unwavering commitment to delivering successful outcomes for his clients. His expertise in antitrust and trade law is complemented by a deep understanding of commercial litigation, making him a versatile and authoritative figure in the legal field. William's approach to law is characterized by meticulous preparation and strategic foresight, ensuring that each case is handled with the utmost precision and care. He is dedicated to understanding the unique needs of his clients and crafting tailored solutions that align with their business objectives. At Winston & Strawn, LLP, William Charles O'Neil has built a reputation for excellence, integrity, and transparency. His clients benefit from his comprehensive knowledge and his ability to navigate even the most challenging legal landscapes. William's commitment to his clients is evident in the personalized attention he provides and his relentless pursuit of justice. Whether addressing complex antitrust issues or managing high-stakes litigation, William's authoritative presence and professional approach make him an invaluable asset to his clients and the firm.

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