Now expanded by 15% to include more details on electron structure computations, recent developments in density matrix theory, mixed quantum- classical methods for dynamic simulations and more on transient spectroscopy, this book provides a unified description of different charge and energy transfer phenomena in molecular systems. Adopting an easy-to-follow style, making even complex concepts understandable and applicable, the authors manage to bridge the regimes of coherent and dissipative dynamics and thus establish the connection between classic rate theories and modern treatments of ultrafast phenomena. Starting from microscopic models, the common features of the different transfer processes are highlighted with applications ranging from vibrational energy flow in