Dr Jonathan Oates is the Ealing Borough Archivist and Local History Librarian, and he has written and lectured on aspects of London's local history and criminal past, in particular on the Christie case. His books include several volumes in the Foul Deeds series and a trilogy on unsolved London murders. He is also an authority on the Jacobite rebellions of 1715 and 1745 and published Sweet William or The Butcher? The Duke of Cumberland and the '45. His most recent books are Tracing Your London Ancestors and Tracing Your Ancestors From 1066 to 1837.