About

Henry C. Thumann is a seasoned attorney based in Washington, DC, with a practice focused on antitrust and trade law, appeals, and international law. At O’Melveny & Myers LLP, he advises clients on complex legal and regulatory matters that require strategic insight, careful analysis, and a deep understanding of both domestic and cross-border issues. His practice is grounded in helping clients navigate challenging disputes and sophisticated legal questions with clarity and precision. With extensive experience in high-stakes legal matters, Mr. Thumann approaches each case with a practical, client-centered perspective. He is known for providing thoughtful counsel tailored to the unique needs of businesses and organizations operating in highly regulated and competitive environments. Whether addressing antitrust concerns, appellate issues, or international legal matters, he works to develop effective strategies that align with his clients’ objectives while managing risk and protecting their interests. Mr. Thumann’s practice reflects a commitment to responsive service, rigorous preparation, and strong advocacy. He is dedicated to helping clients make informed decisions and move forward with confidence in matters that often have significant legal and commercial implications. From his Washington, DC office at 1625 Eye Street Northwest, he serves clients seeking experienced representation in antitrust & trade law, appeals, and international law.

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