Jan Zalasiewicz is geologist, paleontologist, and stratigrapher. He is Emeritus Professor of Palaeobiology at the University of Leicester, UK and a member of the Anthropocene Working Group. He focuses on geology and Earth history, in particular on fossil ecosystems and environments that span over half a billion years of geological time. He has taught students how to interpret rocks and rock structures for more than 20 years in the field and lecture halls, as well as leading field trips for geological groups.