This dissertation addresses the question: what is personal autonomy? It begins by examining the main theoretical accounts of autonomous agency currently on offer. Although each of the available approaches faces significant criticism, I defend a revised internalist (and functionalist) account of autonomous agency which draws primarily upon the work of Frankfurt, Dworkin, and Bratman. Next, I show that recent work in scientific psychology (viz. research on automaticity) reveals new dangers for any account of autonomous agency (including my own newly revised internalist account). My response to the identified threat of automaticity draws upon research in the psychology of attention and, more extensively, on theorizing upon the unity of conscio...