This is a cultural and intellectual biography of a neglected but important figure, Thomas Morgan (1671/2–1743). Educated at Bridgewater Academy, he was active as Presbyterian preacher, medical practitioner, and one of the first who called himself a Christian Deist. Morgan was not only a harbinger of the disparagement of the Old Testament, but also a prolific pamphleteer about things religious, and a publisher of medical books. He received praise for his medical work, but a negative press for his theological visions, and he ended as a forgotten figure in history; this book restores an overlooked writer to his due place in history. It is the first modern biography of Morgan and its readership comprises historians of deism, the enlightenment, the eighteenth century, theology and the church, Presbyterianism, and medical history.