Jaap Beuker (1952) was curator of archaeology and head curator at the Drents Museum in Assen (Netherlands). Since his retirement in 2017 he has carried out research on various archaeological subjects such as flint technology and prehistoric use of exotic materials. Since the mid-1980s he has worked on the prehistoric import of flint from Heligoland. He has written several articles and books on stone artefacts and especially about the use of red and tabular Heligoland flint. Erik Drenth works as a specialist in prehistoric inorganic material culture (flint, hand-made pottery, metal and stone) at the Dutch archaeological research company BAAC. He has written numerous articles, including contributions to several handbooks on Dutch archaeology, such as ‘Nederland in de prehistorie’. Klaus Hirsch (1964) has worked since 2006 as a field archaeologist in the archaeological department of Museum Sønderjylland in Haderslev, Southern Jutland (Denmark). Prior to his work in Denmark, he was employed as a field archaeologist in the State of Mecklenburg-Vorpommern in northeastern Germany. He is a trained prehistoric archaeologist with a special interest in the Late Palaeolithic as well as experimental archaeology, flint sourcing and the prehistoric distribution and exchange of flint in Northern Europe. He has written several articles on various topics, such as experimental archaeology. Moritz Mennenga (1985) is an archaeologist with a focus on the Neolithic of Northern and Northwestern Europe and a research associate at the Lower Saxony Institute for Historical Coastal Research (NIhK) in Wilhelmshaven. He conducts research on the Neolithic settlement and burial landscape in particular, with a special focus on the analysis of Stone Age sites, landscape reconstruction and human-land relationships. In addition to his archaeological focus, he works in the field of digital archaeology. Dr. Martin Segschneider (1966) specialises in coastal and maritime archaeology and works as a senior researcher at the Lower Saxony Institute for Historical Coastal Research (NIhK) in Wilhelmshaven/Germany. He has published various articles and books about the archaeology of the North Frisian Islands and Heligoland, including the topics of the historic role of Heligoland red flint and prehistoric seafaring.