About

William Gibbs Sullivan is a seasoned attorney with more than 47 years of legal experience representing clients in a wide range of complex matters. Based in Chicago, Illinois, and practicing with Clark Hill Plc, he focuses on Administrative Law, Admiralty & Maritime, Antitrust & Trade Law, and Appeals. His extensive background gives him a deep understanding of the legal and regulatory issues that can affect businesses and individuals facing high-stakes disputes, compliance concerns, and appellate challenges. Throughout his career, Mr. Sullivan has developed a practice grounded in careful analysis, strategic thinking, and practical advocacy. In administrative matters, he helps clients navigate regulatory frameworks and agency processes with clarity and precision. His admiralty and maritime work reflects familiarity with the specialized issues that arise in transportation, shipping, and related commercial matters. He also brings significant experience to antitrust and trade law matters, where businesses often require knowledgeable counsel to address competition, market access, and cross-border concerns. In appellate practice, he approaches each matter with a disciplined focus on legal argument, issue preservation, and persuasive writing. Clients turn to William Gibbs Sullivan for thoughtful counsel, responsive service, and a professional approach tailored to the demands of each case. He is committed to helping clients understand their options and work toward effective solutions in matters where experience and attention to detail matter most.

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