His research and teaching interests include civil procedure, torts, election law, legal theory, and law and economics. His scholarship includes proposals for alternative approaches to campaign financing following Citizens United, highlighting the unexpected democracy-enhancing effects of judicial review, and the dangers of aggressive judicial review of administrative agencies. His recent work concerns class action doctrine and its relationship to collective entities like corporations and states and a broad-ranging project on the implications of joint intention, such as its application to complicity and conspiracy.