John is the co-head of Allen & Overy’s global Competition practice and the head of the firm’s DC Investigations and Litigation practice. He advises US and international clients involved in domestic and cross-border antitrust and other regulatory investigations and litigation. His practice spans government enforcement and private litigation of cartel and other antitrust infringements, market sector investigations, and general antitrust compliance, across all industry sectors. 

Previously, John was Director of Criminal Enforcement of the DOJ, Antitrust Division, where he had management responsibility for the Antitrust Division’s criminal investigations and litigation nationwide. In his tenure with the Antitrust Division, John investigated, litigated and presided over some of the largest global cartel investigations undertaken by the DOJ. He also served as the Antitrust Division’s primary liaison with state, federal and foreign law enforcement authorities, as well as the Antitrust Division’s Financial Fraud Coordinator for inter-agency prosecutions, investigations, and information sharing. John’s DOJ service earned him awards of distinction from the Attorney General of the United States and Assistant Attorney General for the Antitrust Division.