Author of fourteen non-fiction books on historical and geographical subjects and contributor to several atlases and other reference works. Recent titles include The Times Extreme Survivors and The Times Britain From Above.
A military historian who has applied his unrivalled expertise in the field of military maps. He is a Fellow of the Royal Geographical Society, the founder of the Historical Military Mapping Group of the British Cartographic Society, a member of the Defence Surveyors Association and the author of Mapping the First World War and of standard works on trench mapping and toponymy.