Duane Braun holds a Ph.D. from Johns Hopkins University and was a Geosciences Professor at Bloomsburg University, Pennsylvania, where he taught Environmental and Physical Geology, Geomorphology, Hydrogeology, and Field Geology. He also mapped the glacial deposits of northeastern Pennsylvania for the state Geologic Survey, taught Geology for Acadia Senior College, and revised the geologic maps of MDI for the Maine Geologic Survey. Ruth Braun holds a M.Sc. degree from Johns Hopkins University. She has taught junior and senior high school science. She also taught Environmental Geology, Physical Geology, and Historical Geology at Bloomsburg University, and has taught Geology for Acadia Senior College. Duane and Ruth Braun are coauthors of Guide to the Geology of Mount Desert Island and Acadia National Park.