Quantum Transport Theory is a comprehensive account of recent achievements in the understanding of disordered conductors. In addition to detailing the density matrix description of nonequilibrium statistical mechanics, Professor Rammer deals with topics that are new to the field of condensed matter physics, such as: weak localization, destruction of electronic phase coherence in disordered conductors, electron-electron and electron-phonon interactions 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 used to study quantum kinetic equations and linear response theory.