The concepts and methods of Statistical Physics play a key role, not always fully perceived, in all branches of Physics. With this textbook, aimed primarily at advanced undergraduates but useful also for experienced researchers, Heissenberg and Sagnotti explain clearly and convincingly why it is so. Besides presenting a modern exposition of the basic facts of Statistical Physics well equipped with problems, a stimulating and broad range of advanced topics is introduced, whetting the appetite of the determined reader and pushing them to go farther to Quantum Field Theory and Mathematical Physics.' Prof. Roberto Raimondi, Università Roma Tre