Ms Heather Nyong’o > Cleary Gottlieb Steen & Hamilton LLP > San Francisco, United States > Lawyer Profile

Offering a comprehensive cross-border practice, Cleary Gottlieb Steen & Hamilton is equipped to handle the full range of cartel work, including both civil and criminal investigations, litigation defense, and enforcement matters. Regulatory advice is another strength of the team, which includes several former officials from the FTC and the DOJ. Leah Brannon leads the team alongside Jeremy Calsyn, who specializes in global cartel investigations and defense in follow-on class actions. Brannon is recommended for handling investigations by the DOJ, FTC and the European Commission. Being particularly experienced in the application of complex economics to antitrust matters, Kenneth Reinker’s practice spans an array of industries, including pharmaceuticals, medical devices, healthcare, high-technology, media and financial institutions. Daniel Culley has a track record in cross-examinations of government witnesses and focuses on high-tech industries and two-sided markets, while Brian Byrne in San Francisco is adept in cross-border enforcement matters, as well as antitrust-related civil litigation and reviews of M&A. Experienced first-chair trial attorney Heather Nyong’o is equipped to represent her clients, which include multinational corporations and executives, in domestic and international cartel investigations and litigation. Unless stated otherwise, all mentioned lawyers are based in Washington DC.

Cleary Gottlieb Steen & Hamilton maintains a market-leading offering that spans the full range of antitrust litigation, with notable strength in merger litigation and contentious cross-border mandates. Leah Brannon and Jeremy Calsyn jointly oversee the department; Brannon focuses on global merger clearance matters, monopolization cases, and conspiracy litigation, while Calsyn represents clients in class actions and cartel and price-fixing litigation, particularly in the automotive parts industry. Dave Gelfand is a name to note on the merger litigation front, having successfully represented major healthcare and aviation clients in high-profile litigated merger challenges. Heather Nyong’o is another key name for civil antitrust litigation work, regularly representing major multinationals and executives in such cases, while seasoned antitrust litigator George Cary  handles IP-related antitrust work in the high-tech sector from the San Francisco office. Ryan Shores joined from Shearman & Sterling LLP in July 2023, further strengthening the firm’s merger challenge offering. Unless otherwise stated, all mentioned lawyers are based in Washington DC.