William B. Chamberlain (c.1828-1889) was born in Loudon, New Hampshire, and died in Worcester, Massachusetts. He was the son of Mary Baker Eddy's first cousin, Mary Ann (Baker) Chamberlain. He was a homeopathic physician who practiced in Keene, New Hampshire, and then Worcester, Massachusetts. There is no record of Chamberlain studying with Eddy or uniting with the Church of Christ (Scientist).

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