This book, by three well-known statistical mechanicians, is the nonequilibrium companion to Statistical Physics I, Equilibrium Statistical Mechanics, by Toda, Kubo, and Saito published in 1982 (Springer Series in Solid-State Science, Vol. 30). The original publication in Japanese in 1973, second edition in 1978, contained both parts in a single volume. This information comes from a preface by Kubo, dated February 1985, where it is also stated that a considerable part of Chapter 4, Statistical Mechanics of Linear Response, was rewritten and parts of other chapters were revised for the present edition