WILLIAM LEVI represents clients in all stages of litigation. He focuses his practice on commercial disputes and government-facing litigation, including in matters defending against government enforcement actions and challenging federal regulatory action, and he represents clients before federal administrative agencies as well as in federal and state courts.
Prior to joining Sidley, Will served in senior roles at the U.S. Department of Justice from 2018 to 2020, including as Chief of Staff and Senior Counselor to the Attorney General. In those roles, Will had broad responsibilities, including supervision of a wide range of high-profile civil litigation, criminal investigations and prosecutions, and national security matters. He also previously served as Chief Counsel to U.S. Senator Mike Lee and Staff Director of the U.S. Senate Judiciary Committee’s Subcommittee on Antitrust, Competition Policy, and Consumer Rights, which oversees the federal antitrust enforcement agencies and reviews major proposed mergers affecting the national economy. Drawing on these experiences, Will regularly advises clients on strategic legal issues arising from high-stakes litigation, congressional investigations and hearings, and government investigations and regulation.
Will was named a “Future Star” in the District of Columbia by Benchmark Litigation (2025), and he is ranked among an elite group of lawyers as a 2023 “D.C. Rising Star” by The National Law Journal. In recognition of outstanding service to the U.S. Department of Justice, Will was awarded the Department of Justice’s highest honor, the “Edmund J. Randolph Award.”
Following law school, Will clerked for U.S. Supreme Court Justice Samuel A. Alito, Jr. and U.S. Court of Appeals for the Third Circuit Judge Anthony J. Scirica. By appointment of the U.S. Court of Appeals for the D.C. Circuit, Will serves as a member of the Court’s Advisory Committee on Procedures. He is also an elected member of the American Law Institute, a member of the Administrative Law & Government Litigation Advisory Committee of the U.S. Chamber Litigation Center, a member of the nominating committee for the William H. Webster Profiles in Leadership Award for Prosecution, and a former term member of the Council on Foreign Relations.