Quantum Transport Theory is a comprehensive account of recent achievements in the understanding of disordered conductors. Chapters cover the density matrix description of nonequilibrium statistical mechanics and newer topics in the field of condensed matter physics, including: weak localization; destruction of electronic phase coherence in disordered conductors; electron-electron and electron-phonon interaction in dirty metals; scaling theory of localization; the self-consistent theory of localization; and mesoscopic physics. The diagrammatic technique for systems out of equilibrium is developed systematically, and is used to study quantum kinetic equations and linear response theory.