I specialise in the archaeology of the Roman Empire, particularly in its European provinces, and in aerial archaeology. I am interested in the reconstruction of ancient landscapes, in settlement pattern evolution and in social changes from the Late Iron Age to the Roman period in order to quantify the nature and extent of their change through Roman imperialist expansion. Since 1998 I have been involved in establishing aerial reconnaissance as a standard method of archaeological prospection in Romania resulting in an extensive archive of oblique aerial photographs now available online (https://aerialarchaeologyromania.exeter.ac.uk/). Using GIS I reconstruct and analyse large archaeological landscapes based on aerial imagery of various types and acquisition dates and from various sources: oblique photographs from archaeological aerial reconnaissance; archive vertical aerial photography; and declassified WWII military vertical and Cold War (CORONA) imagery, high-resolution multispectral satellite imagery and LiDAR. I am author of Dacia: Landscape, Colonization and Romanization (Routledge, 2007) and co-editor of Archaeology from Historical Aerial and Satellite Archives (Springer, 2013) and of Understanding Roman Frontiers (Birlinn, 2015), alongside many book chapters and journal articles. I advise on aerial and satellite remote sensing aspects a number of research projects and institutions in the UK, Romania, India, Argentina and the USA.