Grace G. King (b. Leonard) (1856-1940) was born in Taunton, Massachusetts, and died in Chicago, Illinois. Her family moved to Chicago around 1879, and in 1881 she married Whitman A. King, a grocer and salesman. The couple moved to Mason City, Iowa, around 1884 before moving back to Chicago by 1900. In June 1886, King became a patient of Mary M. W. Adams and was introduced to Science and Health with Key to the Scriptures. That December, King studied Christian Science with Adams and Elizabeth Webster at their Union Park Institute in Chicago. Although she expressed an interest in studying with Mary Baker Eddy, there is no record of her doing so. By 1889, she was holding Church Of Christ (Scientist) services in her home in Mason City. King is listed as a practitioner in The Christian Science Journal in Mason City, followed by Chicago, from 1890 to 1940. She joined The First Church of Christ, Scientist, in Boston, Massachusetts, on April 1, 1893, and was also a member of First Church of Christ, Scientist, Chicago. King was a member of the National Christian Scientist Association.

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