He joined the faculty in 2008. Professor Milligan teaches Criminal Law, Criminal Procedure, Law & Religion, and Jurisprudence. His scholarship centers on how judges make rules regulating the criminal justice system. Milligan’s articles have been published by Boston University Law Review, Cardozo Law Review, Emory Law Journal, Georgia Law Review, and Washington & Lee Law Review, among others. He is a member of University of Louisville's Faculty Senate and Kentucky’s Public Advocacy Commission.