Selwin B. (Bancroft) Peabody (1839-1889) was born in Sutton, New Hampshire, and died in Tilton, New Hampshire. He was educated at the New Hampshire Conference Seminary and Female College, Tilton. After graduating, he went into the medical profession, studying in the office of Dr. Byley Lyford in Tilton. During the Civil War, he served in Company C of the Massachusetts 40th Volunteer Infantry regiment. In 1869, he started working in the woolen mill of Alexander H. Tilton, the husband of Mary Baker Eddy's eldest sister, Abigail. Then in 1878, after the death of Alexander, he became a partner in the mill with Abigail and then assumed full ownership of the mill in 1886 when Abigail passed on.

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