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John Muench is a partner in Mayer Brown's Litigation and Supreme Court and Appellate Litigation groups. His practice focuses especially on general and appellate litigation, with particular emphasis on antitrust, telecommunications, state and federal constitutional law, preemption, state and federal jurisdiction and procedure, mass tort and products liability securities, and class actions. John handles complex civil litigation and has written dozens of briefs and argued numerous cases in state and federal appellate and supreme courts.

Within the firm's Litigation practice, John is also a member of the telecommunications subgroup, which was named "Communications Law Firm of the Year" in 2003 by Chambers USA. He is recognized in Chambers USA's Guide to America's Leading Business Lawyers as a "leading individual" in the area of Communications and Technology Law. Chambers reported that John "is regarded as 'strategic' and 'terrifically creative'" and that "[c]lients consider him to be 'astute, diplomatic and responsive.'"

Prior to joining Mayer Brown in 1983, John taught constitutional law, federal courts, and evidence at the University of Illinois College of Law (1978-1983). Earlier, he served as Law Clerk to The Honorable John Paul Stevens, Associate Justice, Supreme Court of the United States, Washington, DC (1977-1978) and to The Honorable Robert A. Sprecher, US Court of Appeals for the Seventh Circuit (1976-1977).