"Statistical Methods in Quantum Optics 2 - Nonclassical Fields" continues the development of the methods used in quantum optics to treat open quantum systems and their fluctuations. The book presents its material at a level suitable for beginning researchers or students in an advanced course in quantum optics, or a course in quantum mechanics or statistical physics that deals with open quantum systems. The text is complemented by exercises and interspersed notes that point the reader to side issues or a deeper exploration of the material presented. Carmichael's Statistical Methods in Quantum Optics 1 - Matter Equations and Fokker-Planck Equations was published in 1998.