Mary C. Wynkoop (1841-1922) was born in Jackson, Tennessee, and died in Los Angeles, California. She married Henry W. Wynkoop, a telegraph operator, in Madison, Tennessee, in 1862. She studied with Edward H. Hammond, a student of Mary Baker Eddy's, in 1886. Although she expressed an interest in studying with Eddy at the Massachusetts Metaphysical College, there is no record of her doing so. Wynkoop joined The First Church of Christ, Scientist, in Boston, Massachusetts, on March 31, 1894. She moved to Los Angeles in 1910. Wynkoop was listed in the directory of The Christian Science Journal as a Christian Science practitioner from 1895 to 1898 in Jackson, Tennessee, then in 1900 in New York, New York, then from 1903 to 1921 in Rochester, New York.

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