Judge Napolitano taught constitutional law and jurisprudence at Delaware Law School for two years and at Seton Hall Law School for 11 years. He was often chosen by the students as their most outstanding professor. He returned to private practice in 1995, and began television work in the same year.

Judge Napolitano is nationally known for watching and reporting on the government as it takes liberty and property. He lectures nationally on the U.S. Constitution, the rule of law, natural law, civil liberties, and human freedom. He has been published in the New York Times, Wall Street Journal, Los Angeles Times, St. Louis Post-Dispatch, New York Sun, Baltimore Sun, New London Day, Seton Hall Law Review, New Jersey Law Journal and Newark Star-Ledger, and his newspaper column is seen by millions every week.

He is the author of nine books on the U.S. Constitution, two of which have been New York Times bestsellers. His books include Suicide Pact: The Radical Expansion of Presidential Powers and the Assault on Civil Liberties; Theodore and Woodrow: How Two American Presidents Destroyed Constitutional Freedom; The Freedom Answer Book: How the Government is Taking Away Your Constitutional Freedoms; It Is Dangerous to Be Right When the Government Is Wrong: The Case for Personal Freedom; Lies the Government Told You: Myth, Power, and Deception in American History; Dred Scott's Revenge: A Legal History of Race and Freedom in America; A Nation of Sheep; The Constitution in Exile: How the Federal Government Has Seized Power by Rewriting the Supreme Law of the Land; and Constitutional Chaos: What Happens When the Government Breaks Its Own Laws.