Mary Baker Eddy (1821-1910) was an influential spiritual leader and founder of Christian Science. She experienced numerous health challenges in her early life but claimed to have been healed through her deepening understanding of Christianity. In 1875, she published "Science and Health with Key to the Scriptures," outlining her spiritual teachings. Eddy founded the Church of Christ, Scientist, and established the Christian Science Monitor newspaper. Her teachings emphasized the healing power of prayer and the connection between spirituality and physical health, influencing many followers.