Ann Preston-Jones has an extensive knowledge of the county's archaeology, with over thirty years' experience working for Historic England and Cornwall Archaeological Unit. Her experience is mostly in the care, conservation and management of those sites which make Cornwall special and she has a particular passion for sculptured stone monuments. Andrew Langdon has been recording and researching the stone crosses of Cornwall, as well as medieval ecclesiastical monuments more generally, throughout his lifetime, beginning when he was still at school. He has written extensively on the crosses and has much practical experience in their repair and restoration. Elisabeth Okasha spent most of her working life in University College Cork, retiring as professor emerita. Her research interests and publications are mainly in the area of early medieval inscriptions, covering those in Anglo-Saxon England, Cornwall, Pictland and Ireland.