Professor Seamon joined the University of Idaho in 2004, having previously taught at the University of South Carolina School of Law and Washington and Lee Law School. He teaches Administrative Law, Constitutional Law, and Federal Courts. He also served as the associate dean for administration and students from 2006-2009.

Before he became a law professor, Professor Seamon practiced law for about ten years. In 1986, he clerked for Kenneth W. Starr on the U.S. Court of Appeals for the District of Columbia Circuit.  Later, he worked as an associate at the Washington, D.C. law firm Covington & Burling, and he served in the U.S. Department of Justice as an assistant to the Solicitor General of the United States. While at the Justice Department, Professor Seamon presented oral argument before the U.S. Supreme Court in fifteen cases.

Professor Seamon has written two books on administrative law and many law review articles on issues of constitutional law and other public law subjects.

Professor Seamon received his J.D. from Duke Law School and holds a B.A. and an M.A. from Johns Hopkins University. He graduated from law school as a member of Order of the Coif and from college as a member of Phi Beta Kappa. He is also an elected member of the American Law Institute.