John Fielden, industrial magnate and radical Member of Parliament for Oldham in Lancashire from 1832 to 1847, was best known as a leading advocate of factory reform. Drawing on a rare collection of Fielden family papers, this biographical study provides a fresh assessment of each of the movements in which Fielden became involved and of his role within them, and discusses the influences that shaped this radical industrialist who occupied a unique place in Parliament as the voice of the people.