John B. Crocker (1825-?) was born in England and most likely died in Illinois. He was a student of Mary Baker Eddy's, studying with her in Chicago in May 1884. Before he studied with Eddy, he and his wife Charlotte were spiritualists, founding the Spiritual Association in St. Louis, Missouri, in 1882. Crocker renounced Spiritualism during Eddy's class and afterwards attended meetings with other students from that class. There is no record of him joining the Church of Christ (Scientist).

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