B. Ronald Frost is Emeritus Professor of Geology at the University of Wyoming. He has conducted extensive field research in the Precambrian basement of Wyoming, as well as in Siberia, Greenland, Northern Canada, and the Broken Hill area of Australia. He is the author of more than 110 scientific papers on topics ranging from serpentinization and the metamorphism of serpentinites, ocean floor metamorphism, granulites, thermobarometry, the geochemistry of granites, and melting of sulfide ore deposits. He was previously an associate editor for the Journal of Metamorphic Geology and Geochimica et Cosmochimica Acta, and served on the editorial board of the Journal of Petrology. Carol D. Frost joined the Department of Geology and Geophysics at the University of Wyoming in 1983 after receiving her Ph.D. in Earth Sciences at the University of Cambridge. She investigates the origin and evolution of the continental crust, the provenance of clastic sedimentary rocks, granite petrogenesis, and applies isotope geology and geochemistry to environmental issues including water co-produced with hydrocarbons and geological sequestration of carbon dioxide. She is a Fellow of the Mineralogical Society of America, Geological Society of America, and the Geochemical Society, and served as Division Director for the Division of Earth Sciences at the National Science Foundation from 2014–18.