Motivated by recent dramatic developments in the field, this volume provides a thorough introduction to spin and its role in elementary particle physics. Starting with a simple pedagogical overview of spin and its relativistic generalization, the author successfully avoids the obscurity and impenetrability of traditional treatments of the subject. He surveys the main theoretical and experimental developments of recent years, as well as discussing exciting plans for the future. Emphasis is placed on the importance of spin-dependent measurements in testing QCD and the Standard Model. This book will be of value to graduate students and researchers in all areas of quantum physics, particularly in elementary particle and high energy physics. It is suitable as a supplementary text for graduate courses in theoretical and experimental particle physics.