Although I am interested in various aspects of military history, I specialise in 17th century fortifications and sieges, and am particularly interested in the Wars of the Three Kingdoms (1639-1652), and the works of great French military engineer, Marshall Vauban.

I am a committee member of the Fortress Study Group, writing regularly for the journal Fort and the magazine Casemate. I also write regularly for Military History Matters. I am also a member of the Battlefields Trust and Pike and Shot Society.

I have written three books, London in the Civil War (Partizan Press, 2008), The English Civil War Defences of London (The Stuart Press, 2014), and Civil War London: a military history of London under Charles I and Oliver Cromwell (Helion and Company, 2017 - see also London’s role during the ‘English’ Civil War – overlooked? and Introducing I have contributed chapters about Wenceslaus Hollar's illustrations of fortifications and sieges to Perspectives on Wenceslaus Hollar (Brepols), and The British Experience of War 1618-1721 and Britain Turned Germany' The Thirty Years' War and its impact on the British Isles 1638-1660 (both published by Helion and Company).  

Much of my research is undertaken ‘in the field’: understanding the topography of a site is just as important as a knowledge of the events which surround it. I have travelled extensively throughout the British Isles and across Europe, and as far afield as North America and South Africa visiting fortifications and siege-sites. I was honoured with the award of Fellowship of the Royal Geographical Society in 2013 and am part of the Society’s Discovering Britain project.

Regarded as “the one expert on London's civil war defences”, my expertise has been called upon to assist with archaeological investigations within the capital, most recently providing advice to the post-excavation stage of the excavations at the British Museum which uncovered a section of London’s defensive rampart and ditch. If you would like to discuss such projects, please contact me via the contact form.

I am also Project Manager for the King's Lynn Under Siege (KLUS) English Civil War Archaeological Project, part of Military History Live.

I give lectures and talks to a variety of audiences, including archaeological societies and local history groups. If you would like me to talk to your organisation, please contact me via the contact form.

Fortress Study Group

Discovering Britain

Scottish Battlefields Trust

Battlefields Trust

Military History Live

Pike and Shot Society

Undiscovered Scotland

Centre for Experimental Military Archaeology