Julia Field-King (b. Kinley) (c. 1840-1919) was born in Aurora, Illinois, and died in Boston, Massachusetts. She graduated from Oberlin College in Oberlin, Ohio, and from Hahnemann Medical College, a homeopathic medical school in Chicago, Illinois. She worked as a homeopathic physician and was a member of the Congregational church. She first married James D. Field, and after he passed away in 1873, she married Hervey King in 1878 and would sign her name "Field-King" going forward. She was a student of Emma Curtis Hopkins in September 1886 and of Joseph A. Adams in May and October 1887, both of whom were students of Mary Baker Eddy's. Field-King became a student of Eddy's herself, completing the Primary class in September 1888 and the Normal class in May 1889. She became a member of the Christian Scientist Association in October 1888 and joined The First Church of Christ, Scientist, in Boston, Massachusetts, on October 5, 1892. In January 1892, she became editor of The Christian Science Journal and served as such for nine months until she resigned to devote her time to healing and teaching. Four years later, in 1896, Eddy asked her to go to London, England, to help establish Christian Science there. Field-King had previously organized and established a Christian Science church in St. Louis, Missouri. Her efforts proved successful and resulted in the formation of First Church of Christ, Scientist, London, and the dedication of the church's edifice in 1897. In June 1902, Field-King was placed on probation as a member of The Mother Church. Three months later she was dismissed at her own request. She reunited with the Church as a probationary member in 1917, remaining as such until her passing.

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