Kate I. Barker (1838-1904) was born in Bethel, Maine and died in Santa Barbara, California. She was a patient of George D. Choate, a student of Mary Baker Eddy's, who practiced in Bethel, Maine, for a few years. Choate's treatment of Barker was unsuccessful, with both Eddy and Choate blaming the mesmeric influence of dissident student Richard Kennedy.

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