Cleary Gottlieb Steen & Hamilton

Cleary Gottlieb Steen & Hamilton fields a highly regarded antitrust litigation practice recognised for its work on precedent-setting matters. The team offers expertise across merger litigation, class action defense, and antitrust disputes, including matters where antitrust intersects with corporate, regulatory, and sector-specific law. San Francisco-based George Cary is an authority with decades of experience in sophisticated transactions and monopolization litigation. Leah Brannon, co-head in Washington, DC, focuses on litigation, merger reviews, and government investigations, advising on matters in federal and state courts as well as investigations by US and international authorities. Also in DC, Jeremy Calsyn handles the full range of antitrust work, including class actions and cross-border investigations. Heather Nyong’o, co-head in the Bay Area, is a seasoned first-chair trial attorney specialising in enforcement, international cartel disputes, and high-stakes civil and criminal litigation. In 2025, the team added four new partners, three promoted internally and one hired laterally from A&O Shearman, strengthening depth across its practice areas.