3/25/21: Dr. Jonathan Payne, Professor, Geological Science, Stanford University, Stanford, California.
4/8/21: Dr. Peter Burgess, Professor of Sedimentary Geology and Head of Earth Sciences, University of Liverpool, Liverpool, United Kingdom.
4/29/21: Dr. Hildegard Westphal, Professor, Geoecology & Carbonate Sedimentology and Director of the Center for Marine Environmental Science, Bremen University, Bremen, Germany.