A historian claims Jack The Ripper, the notorious serial murderer who killed at least five prostitutes in a 1888 London killing spree, is a Polish-born Jewish pimp. Joseph Silver, later known as Johannesburg's "King of the Pimps," was in London at the time of the murders and has a history and profile that closely fit Jack The Ripper. Silver was also in the US, and did time in Sing Sing prison for burglary in the years after the Ripper murders.