A-Z maps are the largest independent map publisher in the United Kingdom providing cartographic services, digital data products and paper mapping publications (including Street Atlases, Visitors Guides, Great Britain Road Atlases and The Adventure Atlas). Historian specializing in the classical and medieval world. He is the author of the DK Companion Guide to World History (2010), The Empire Stops Here: A Journey Around the Frontiers of the Roman Empire (Jonathan Cape 2009), The Northmen's Fury: A History of the Viking World (Jonathan Cape 2014), Revolution (Andre Deutsch, 2017). He was co-author of The Times History of the World in Maps (2014) and General Editor of The Great Trade Routes: A History of Cargoes and Commerce Over Land and Sea (Anova 2012). He was a contributor to DK History Year by Year (2011) and DK History of the World in 1000 Objects (2014). He previously worked as a diplomat and a publisher of historical atlases.