Jan Kozák was originally engaged in laboratory seismology and later moved to historical studies in seismology and volcanology. In addition to his scientific work, he has been an ardent collector of old prints; within the last 40 years he collected one of the world largest series – over 2300 of pre-photographic depictions of earthquakes, volcanic eruptions, and tsunamis. Among his 170 publications there are over ten books of pictorial character dealing mostly with the Earth sciences, and also with historical architecture and European history. Hw is senior research scientists in the Geophysical Institute of the Czech Academy of Sciences.Roger Musson is internationally known as a seismologist, author and broadcaster. He worked for over 30 years as a seismologist with the British Geological Survey in Edinburgh, specialising in the study of historical earthquakes, the history of seismology, and seismic hazard. His most recent book, “The Million Death Quake” ispublished by Palgrave Macmillan.