Allen Glazner is Distinguished Professor of Geology Emeritus at the University of North Carolina at Chapel Hill. He earned a B.A. in Geology from Pomona College and a Ph.D. in Geology from the University of California at Los Angeles. An award-winning teacher specializing in igneous petrology, tectonics, and geoinformatics, he is also author of five books in the popular Geology Underfoot.series.Matt Kohn is Distinguished Professor in Geosciences at Boise State University. He earned a B.S. in Geology from the Massachusetts Institute of Technology and an M.S. and Ph.D. in Geology from the Rensselaer Polytechnic Institute. He uses geochemistry of metamorphic rocks to investigate orogenesis and geochemistry of fossil teeth to study Cenozoic paleoclimate and paleoecology. His book Tested describes his adventures in China during the pandemic.