Unification and Supersymmetry : The Frontiers of Quark Lepton Physics Derived from a course given at the University of Maryland for advanced graduate students this book deals with some of the latest developments in our attempts to construct a unified theory of the fundamental interactions of nature. Among the topics covered are spontaneous symmetry breaking grand unified theories supersymmetry and supergravity. the book starts with a quick review of elementary particle theory and continues with a discussion of composite quarks leptons Higgs bosons and CP violation; it concludes with consideration of supersymmetric unification schemes in which bosons and leptons are considered in some sense equivalent. The third edition will be completely revised and brought up to date particularly by including discussions of the many experimental developments in recent years. Important Basic Concepts in Particle Physics Spontaneous Symmetry Breaking Nambu Goldstone Bosons and the Higgs Mechanism The SU(2)L × U(l) Model CP Violation: Weak and Strong Grand Unification and the SU(5) Model Left Right Symmetric Models of Weak Interactions and Massive Neutrinos SO(10) Grand Unification Technicolor and Compositeness Global Supersymmetry Field Theories with Global Supersymmetry Broken Supersymmetry and Application to Particle Physics Minimal Supersymmetric Standard Model Supersymmetric Grand Unification Local Supersymmetry (N = 1) Application of Supergravity (N = 1) to Particle Physics Beyond N = 1 Supergravity Superstrings and Quark Lepton Physics.