Alice Guppy

Alice Guppy worked for the future Torchwood 3 circa 1898. Arrested for theft, in 1898, future partner (possibly in more ways than one) Emily Holroyd contacted her and offered her a pardon in exchange for working for the Torchwood Institute after the lost of another, male, operative also operating out of Cardiff. Holroyd believed that Guppy's willingness to steal and possibly kill could come in useful. (Torchwood.org.uk)

Emily and Alice, in turn, offered Jack Harkness a place working for Torchwood in Cardiff, after discovering that he couldn't die and that he possibly knew about the Doctor. (TW: Fragments)

In 1901 she found Jack, who had been buried by Gray in 27 AD. (TW: Exit Wounds)