Joseph Priestley (1733-1804) is one of the major figures of the English Enlightenment. A contemporary and friend of Benjamin Franklin and Thomas Jefferson, he exceeded even these polymaths in the breadth of his curiosity and learning. Yet no one has attempted an all-inclusive biography of Priestley, probably because he was simply too many persons for anyone easily to comprehend in a single study. Robert Schofield has devoted a lifetime of scholarship...