Writing
In Maremma: Life and a House in Southern Tuscany: A Revised and Expanded Edition, Counterpoint, 2011. (Co-authored with Mark Mitchell.)
The Man Who Knew Too Much: Alan Turing and the Invention of the Computer, Atlas/Norton, 2006.
Florence, A Delicate Case, Bloomsbury, 2002.
In Maremma: Life and a House in Southern Tuscany, Counterpoint, 2001. (Co-authored with Mark Mitchell.)