Cotton Mather: BritannicaCotton Mather, (born February 12, 1663, Boston, Massachusetts Bay Colony [U.S.]—died February 13, 1728, Boston), American Congregational minister and author, supporter of the old order of the ruling clergy, who became the most celebrated of all New England Puritans. He combined a mystical strain (he believed in the existence of witchcraft) with a modern scientific interest (he supported smallpox inoculation).