William G. Ewing (1839-1922) was born in Illinois and died in Highland Park, Illinois. He studied at Illinois Wesleyan University in Bloomington and then began studying law in the office of Robert E. Williams at age twenty. He worked for the firm for three years, until he was admitted to the Illinois Bar in 1861. Work brought him to Quincy, Illinois, where for nineteen years he served at different times in the capacity of City Attorney, Superintendent of Schools, and State's Attorney for the Judicial Circuit. In 1865, he married Ruth B. Ewing (b. Babcock), who would later become a student of Mary Baker Eddy's, as well as a practitioner and teacher. In 1882, his family moved to Chicago, Illinois, and he formed a law firm with his brother. Ewing was baptized in the Presbyterian Church and remained an active member into adulthood. Around 1884, he received Christian Science treatment through prayer from Annie V. C. Leavitt, a student of Eddy's, and both he and his wife became interested in Christian Science. In 1886, he was appointed United States District Attorney for the Northern District of Illinois by President Grover Cleveland and served as so until 1890. In 1892, Ewing was elected Judge of the Superior Court of Cook County, where he served six years. He joined The First Church of Christ, Scientist, in Boston, Massachusetts, on June 3, 1899, and started serving full time on the Christian Science Board of Lectureship at the invitation of Eddy from 1899 until 1910. In 1902, he made the first overseas tour of Great Britain by an American Christian Science lecturer, and in 1904 he was the first to visit Mexico. That same year, he became a member of the General Association of Teachers. Eddy called Ewing "our best lecturer."

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