Sheppard, Mullin, Richter & Hampton LLP

With a strong track record in antitrust investigations, prosecutions, and enforcement actions, Sheppard, Mullin, Richter & Hampton LLP is frequently instructed by both domestic and multinational clients. Renowned for its expertise in the technology sector, the group brings deep insight into the intersection of antitrust and intellectual property law, handling complex issues like patent pooling, product distribution, and licensing restrictions. Based in Washington DC, the practice is co-led by Leo Caseria, who handles federal and state cartel investigations, and former DOJ official Ann O’Brien, who brings extensive experience in domestic, international, and multi-agency cartel matters, including federal jury trials.