Gibson, Dunn & Crutcher LLP

Gibson, Dunn & Crutcher LLP maintains a preeminent presence before the US Supreme Court, where it demonstrated exceptional activity over the past year by presenting five oral arguments. The firm’s national reach is anchored by a trio of practice chairs: Thomas Dupree Jr. in Washington DC, Allyson Ho in Dallas, and Julian W. Poon in Los Angeles. Dupree Jr. specializes in unraveling complex federal regulations and commonly represents the entire rail industry, as he regularly appears for the Association of American Railroads. In Dallas, Ho oversees the firm’s significant presence in the Fifth Circuit and recently appeared before the US Supreme Court in December 2025 to address a significant circuit split regarding First Amendment claims. Poon leads the California-based appellate efforts and is a specialist in neutralizing high-exposure trial outcomes, recently evidenced by a challenge to a $243m judgment against Tesla involving its autopilot features. The wider team includes Los Angeles-based veteran strategist Theodore Boutrous, who recently led the appellate defense for Nestlé in a complex supply chain matter. In Washington DC, the group is further bolstered by Thomas G. Hungar, who secured a unanimous US Supreme Court victory reinforcing corporate separateness in trademark disputes, and Miguel A. Estrada, who recently prevailed in the DC Circuit by defeating a state-owned energy company’s sovereign immunity claim in a high-stakes international expropriation dispute. Notably, the US Supreme Court afforded Dallas associate Stephen Hammer the rare honor of a direct appointment to argue an immigration case.