A&O Shearman

With antitrust expertise across Dallas, New York, San Francisco, Silicon Valley and Washington DC, the A&O Shearman merger control offering regularly handles complex, strategic transactions. The team’s international reach is particularly notable. David Higbee heads the global antitrust practice, with notable government experience and industry expertise across the defense, oil and gas, financial services, and technology sectors. The firm’s merger control offering is complemented by its antitrust litigation practice, headed by Todd Stenerson. For multi-national mergers, companies seek out Jessica Delbaum in New York, noted for her experience before the FTC and Department of Justice. Also in New York, Elaine Johnston has longstanding experience of matters in the chemicals, pharma, and healthcare industries. The intersection of antitrust law and intellectual property is an area of interest for Noah Brumfield, who splits his time between DC and Silicon Valley. Puja Patel departed the team in January 2025. Team members are based in Washington DC unless otherwise stated.