Mary Baker Eddy (July 16, 1821 – December 3, 1910) was an American religious leader who founded Christian Science, a new religious movement, in New England in the latter half of the 19th century.
Author of the movement's main textbook, Science and Health with Key to the Scriptures, first published in 1875, Eddy argued that the material world does not exist and, in particular, that sickness is a mental error that can be corrected by Christian Science prayer.
Four years later, she and 26 followers founded the Church of Christ, Scientist in Lynn, Massachusetts.Eddy started several magazines about the religion—the Christian Science Sentinel, Christian Science Journal, and The Herald of Christian Science—and in 1908, at the age of 87, The Christian Science Monitor, a newspaper that won seven Pulitzer Prizes.
By 2001, Science and Health with Key to the Scriptures had sold over nine million copies.