John Langdon Dudley (1812-1894) was born in Andover, New Hampshire, and died in Boston, Massachusetts. He attended Andover Theological Seminary in Andover, Massachusetts, and graduated from Amherst College in Amherst, Massachusetts, in 1844. He was ordained in 1847. Dudley married Eliza M. Dudley (b. Coleman) in 1861. She passed away in 1871, and he married Marion V. Dudley (b. Churchill) in 1872. Dudley was pastor of the South Congregational Church of Middletown, Connecticut, from 1849 to 1868, and then of Plymouth Church, Milwaukee, Wisconsin, from 1868 to 1875. Afterwards he preached in Chicago, Illinois, and in Denver, Colorado. From 1878 to 1880 he was stated preacher to the Theodore Parker Memorial Society in Boston. He then retired from the ministry, and resided at Lake Mills, Wisconsin, but continued to preach occasionally in various places. He passed away while on a visit to Boston. He was the author of Tides and Tendencies of Religious Thought (1873). Dudley called on Mary Baker Eddy in 1878, and was invited as a guest to a Christian Scientist Association meeting that year. He later attended another at the Massachusetts Metaphysical College in 1885.

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