Dr GEORGE NASH is an Associate Professor at the Museum of Prehistoric Art, Quaternary and Prehistory Geosciences Centre, Maçao, Portugal. George has been a professional archaeologist for the past 25 years and has undertaken extensive fieldwork on prehistoric rock-art and mobility art in Chile, Denmark, Indonesia, Malaysia, Norway, Sardinia, Spain and Sweden. Between 1994 and 1997 he directed excavations at the La Hougue Bie passage grave on Jersey, one of Europe’s largest Neolithic monuments and has also directed preliminary excavations at Westminster Hall, London. He has also written, edited and co-edited many books on prehistoric art and monumentality including the most recent book entitled ‘Archaeologies of Rock Art: South American Perspectives’ (2018). In the past George has been involved in a number of major rock-art recording and interpretation projects, the most recent being in the Central Negev region of southern Israel and in central Andean Chile. In his native Wales, he is convener for the Welsh Rock art Organisation (WRAO). In addition to fieldwork, he has also written and presented programmes on European rock-art and contemporary graffiti for the BBC.