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 to this task. The result is a magisterial book, covering the life and works of Priestley during the critical first forty years of his life. Robert E. Schofield is Professor of History Emeritus at Iowa State University, where he was also Director of the Program in History of Technology and Science. He is the editor of A Scientific Autobiography of Joseph Priestley (1733 - 1804) and the author or editor of numerous other books.