Her current scholarship focuses on the legal history of criminal law and procedure in the twentieth-century United States. A forthcoming book, titled Policing Everyman: How Cars Transformed American Freedom (under contract with Harvard University Press), examines the history of mass automobility to explain the evolution of Fourth Amendment jurisprudence and to explore the problem of police discretion in a society committed to the rule of law. The book is based on her Ph.D. dissertation, which won Law & Society Association’s Dissertation Prize in 2017. Seo has also published in the Yale Law Journal, Law and Social Inquiry, and Law and History Review, among others.