Barrett A. Cox (1834-1902) was born in Hallowell, Maine, and died in Randolph, Maine. At the time he wrote to Mary Baker Eddy, he was the clerk and tollman for the Gardiner & Pittston Bridge Co., a position he held until 1887 when the city of Gardiner and the town of Pittston bought the stock of the company and made it a free bridge. Afterwards he was elected as a selectman and worked as the ice inspector for the town of Randolph, Maine. Although he expressed an interest in Christian Science and studying with Mary Baker Eddy, there is no record of Cox studying with Eddy or uniting with the Church of Christ (Scientist).

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