Henry Baker (naturalist)
He was born in Chancery Lane, London,May 1698, the son of William Baker, a clerk in chancery. In his fifteenth year he was apprenticed to John Parker, a bookseller. At the close of his indentures in 1720, Baker went on a visit to John Forster, a relative, who had a deafmute daughter, then eight years old. As a successful therapist of deaf people, he went on to make money, by a system that he kept secret. His work as therapist caught the attention of Daniel Defoe, whose youngest daughter Sophia he married in 1729.
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Source: Wikipedia