Professor Nick Barratt is an author, broadcaster and historian best known for his work on BBC's Who Do You Think You Are?

He is an honorary associate professor of public history at the University of Nottingham, and Associate Director, Collections and Engagement, at the University of London's Senate House Library as well as a teaching fellow at the University of Dundee.

His most recent publication, The Forgotten Spy, tells the story of his great uncle - Stalin's first mole in Whitehall. He has previously written on subjects as diverse as the story of Greater London and the Titanic.