Joseph M. Copp (1818-1892) was born in Belmont, New Hampshire, and died in Plainwell, Michigan. He was married three times: first, in 1840, to Mary Ann Copp (b. Price), who died in 1850; second, in 1851, to Louisa F. Copp (b. Price), who died in 1852; and finally, later in 1852, to Marie A. Copp (b. Howe). By 1870 he was living in Portville, New York, working as a dry goods and grocery dealer, and by 1880 he had moved to Plainwell, where he became a clothier. Copp was the father of Ann M. Otis (d. 1923), one of Mary Baker Eddy's students. In 1887 Otis wrote to Eddy to order a dozen copies of Science and Health with Key to the Scriptures and enclosed payment endorsed by Copp. Copp's sister Harriet "Hattie" S. Copp was healed through Christian Science treatment by Otis, an account of which was published in the January 1888 issue of The Christian Science Journal.

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