Whether free speech is defended as a fundamental right that inheres in each individual, or as a guarantee that all of society's members will have a voice in democratic decision-making, the central role of expressive freedom in liberating the human spirit is undeniable. Freedom of expression will, as the essays in this volume illuminate, encounter new and continuing controversies in the twenty-first century. Advances in digital technology raise pressing questions regarding freedom of speech and, with it, intellectual property and privacy rights. Campaign finance reform limits the formerly sacrosanct category of 'political speech'. Expressive liberties may face their greatest challenge from government efforts to thwart terrorism. The twelve legal scholars and philosophers whose work appears in this volume examine the history of free speech doctrine, its relevance to other social and personal values, and the radical critiques it has withstood in recent years.