The subtitle, Nonclassical Fields, is perhaps not as accurate as it might be as a summary of content; or to put it another way, if my aim from the start had beeto write a book othis topic, parts of that book would differ significantly from what follows here. Possibly the most important thing missing, and something that should be said, is that there are two quite distinct paths to a definitioof nonclassicality iquantum optics. The first is grounded ithe existence, or otherwise, of a nonsingular and positrve Glauber-SudarshaP function. The physical grounding is ithe treatment of optical measurements, specifically the photoelectric effect: for a giveoptical field, cathe photoelectrocounting statistics, including all correlations, be reproduced by a Poissoprocess of photoelectrogeneratiodriveby a classicallight intensity, allowed most generally to be stochastic? Viewed at a more informallevel, the questioasks whether or not the infamous proposal of Bohr, Kramers, and Slater for the interactioof classical light an

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