Respected historian of science Ronald Numbers here examines one of the most influential, yet least examined, religious leaders of the mid-nineteenth century - Ellen G. White, the enigmatic visionary who founded the Seventh-day Adventist Church. Numbers scrutinizes White's life (1827-1915), from her teenage visions and testimonies to her extensive advice on health reform, which influenced the direction of the church she founded. This third edition features a new introduction and two key documents that shed further light on White - transcripts of the trial of Elder I. Dammon in 1845 and the proceedings of the secret Bible Conferences in 1919.