This book bears witness to the current reawakening of interest in Reid's philosophy. It first examines Reid's negative attack on the Way of Ideas, and finds him to be a devastating critic of his predecessors. Turning to the positive part of Reid's programme, the author then develops a fresh interpretation of Reid as an anticipator of present-day 'reliabilism'. Throughout the book, Reid is presented as a powerful thinker with much to say to philosophers in the twenty-first century. The book will be of interest not only to Reid scholars and historians of philosophy, but also to specialists and students in contemporary epistemology.