This ambitious and important book provides the first truly general account of Francis Bacon as a philosopher. It describes how Bacon transformed the values that had underpinned philosophical culture since antiquity by rejecting the traditional idea of a philosopher as someone engaged in contemplation of the cosmos. The book explores in detail how and why Bacon attempted to transform the largely esoteric discipline of natural philosophy into a public practice through a program in which practical science provided a model that inspired many from the seventeenth to the twentieth centuries. Stephen Gaukroger shows that this reform of natural philosophy was dependent on the creation of a new philosophical persona: a natural philosopher shaped through submission to the dictates of Baconian method. This book will be recognized as a major contribution to Baconian scholarship, of special interest to historians of early-modern philosophy, science, and ideas.