T. Edmund Harvey (1875–1955) is a distinctive figure in British history of the first half of the twentieth century. A Quaker, he was an author, pacifist, social reformer and politician. He was one of only 16 MPs to have sat in Parliament during both world wars. Yet he is a neglected figure. My research aims to show that Harvey was the quintessential politician of conscience, whose Quaker faith was central to his career.