His teaching and research interests include American politics, law and courts, constitutional law and theory, and federalism. Professor Pickerill’s current research focuses on the relationship between the Supreme Court and the other branches of government. He is the author of Congress and Constitutional Deliberation: The Impact of Judicial Review in a Separated System (Duke U. Press 2004) as well as various book chapters and articles in journals such as Perspectives on Politics, Publius, Polity, Georgetown Law Journal, Santa Clara Law Review and Law & Policy. In 2008, Professor Pickerill, together with Paul Chen, published an article titled Medical Marijuana Policy and the Virtues of Federalism in Publius: The Journal of Federalism.