Lucas Walker is an experienced appellate litigator who has argued—and won—cases at every level of the federal judiciary, from district court to the Supreme Court of the United States. He is known for his crisp writing style and creative approach to difficult problems. Clients and other law firms regularly turn to him when confronting novel and challenging legal issues.
Mr. Walker’s practice focuses on Supreme Court and appellate litigation. He recently argued Abitron Austria GmbH v. Hetronic International, Inc. before the U.S. Supreme Court. In a decisive victory for his clients, the Court held that U.S. trademark law does not apply extraterritorially, rejecting a $90 million damages award that rested almost entirely on his clients’ sales in foreign countries. Abitron has been recognized as a landmark extraterritoriality decision with broad implications for transnational litigation.
Mr. Walker has also briefed numerous other cases in the Supreme Court, at both the certiorari and merits stages, and for both parties and amici. He has argued before six U.S. Courts of Appeals and briefed cases in four others. He has also litigated and argued critical motions in district courts.
Mr. Walker’s experience spans a broad range of subject matter, including intellectual property, administrative and constitutional law, energy, bankruptcy, foreign sovereign immunity, telecommunications, and white collar defense. Whatever the subject matter, Mr. Walker brings his characteristic deep thinking, clear writing, and passion for appellate advocacy.
He has particular experience before the U.S. Court of Appeals for the Federal Circuit. There he has litigated such diverse issues as standing to sue for patent infringement, the Biologic Price Competition and Innovation Act, preclusion, personal jurisdiction, and federal civil-service law, as well as traditional patent-law issues like infringement, validity, and damages. In that court, he has defended nine-figure infringement judgments, defeated efforts to take life-saving cancer drugs off the market, and even won a pay raise for every federal judge in America.
Mr. Walker served two clerkships at the U.S. Supreme Court, first with Justice Samuel A. Alito, Jr. and later with Justice Neil M. Gorsuch. He also served as a law clerk to then-Judge Gorsuch prior to joining MoloLamken in 2010.
Mr. Walker teaches Advanced Appellate Advocacy at the George Washington University Law School. He is also co-editor of MoloLamken’s annual Supreme Court Business Briefing.
Mr. Walker has been recognized as a Rising Star by Law360 and National Law Journal, and as a Leading Litigator and Next Generation leader by Lawdragon. The Legal 500 has named him a Next Generation Partner, highlighting his “great writing style.”
Updated Aug 2024
