Isaac Levi has explored the principles of American pragmatism in greater depth and more consistency than others before him. The result is a sophisticated and powerful philosophical system whose key elements stand in stark opposition not only to mainstream epistemology, but also to the positions of other contemporary authors writing in the same pragmatist tradition. The essays in this volume, written by some of philosophy's finest scholars, contribute substantially to the understanding and appraisal of Levi's work. Included in this volume are Levi's extensive and provocative replies to his critics, which offer access to his thinking on a wide range of topics. The introduction provides a concise, systematic presentation of the cornerstone of Levi's pragmatism. Suitable for students and scholars who are interested in American pragmatism in general and Isaac Levi's work in particular, this book is an ideal companion to Levi's own writings.