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.

Professor Mark Williams, a prominent palaeontologist at the University of Leicester, specializes in using the fossil record to decipher past biological changes, offering valuable insights into current and future biospheric transformations in the Anthropocene era. With over three decades of experience, he has conducted extensive research across diverse terrains worldwide, from tropical regions to polar landscapes. Professor Williams is an esteemed member of the Anthropocene Working Group, focusing on human-induced alterations to ecosystems, including the impacts of introduced species in various environments like San Francisco Bay and Leicestershire. His work aims to address solutions for mitigating human-induced changes to the biosphere, a crucial aspect of the emerging Anthropocene epoch. By studying past mass extinctions caused by natural events, such as asteroid strikes and volcanic eruptions, Professor Williams seeks to guide humanity in avoiding similar catastrophic outcomes in the future.