Joseph G. Mann (1864-1932) was born in Broad Brook, Connecticut, and died in Saint Petersburg, Florida. His first occupation was as a farm laborer. In 1886, after he was accidentally shot in the heart and told by doctors he would not survive, he was healed through Christian Science treatment. Mann's affidavit of this healing was published in the book We Knew Mary Baker Eddy. This healing inspired him, along with many of his family members, to begin the study of Christian Science. Mann took Mary Baker Eddy's Primary course in 1888 and her Normal course in 1898. He joined The First Church of Christ, Scientist, in Boston, Massachusetts, on October 5, 1892, and he also became a member of the Christian Science Dispensary Association, the Christian Scientist Association, the General Association of Teachers, and the National Christian Scientist Association. In the late 1880s and early 1890s he lived with two of his brothers in Junction City, Kansas, where he helped organize a Christian Science church and began teaching students. He was listed as a practitioner in Junction City in The Christian Science Journal from 1890 to 1893. In 1894 he moved to Boston, Massachusetts, where he lived with his sister, Pauline Mann, and continued his healing practice. Joseph and Pauline both began working in Eddy's Pleasant View household in 1898, with Joseph serving as Eddy's superintendent and associate secretary off and on until 1907. In 1904, Joseph and Pauline relocated to New Britain, Connecticut, and Joseph worked as a practitioner and teacher there. In 1920, in New York, New York, he married Alice Temple Mann (b. Newman), also a Christian Science practitioner, who had emigrated from England in 1905, and they continued living in New Britain until 1924 when they moved to West Haven, Connecticut. They finally settled in Saint Petersburg in the early 1930s. Mann was a frequent contributor to The Christian Science Journal and the Christian Science Sentinel.

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