David C. Culver received his Ph.D. in 1970 in Biology from Yale University. He is currently Professor of Environmental Science Emeritus at American University, Washington, DC, with broad research interests in subterranean biology, especially biodiversity, biogeography, and shallow subterranean habitats. He has published well over 100 research papers on subterranean biology, and is the author or editor of eight books on speleobiology. He has organized or co-organized international symposia on conservation and protection of karst (1997), mapping subterranean biodiversity (2001), epikarst (2003), karst ecosystems (2007), and carbon in karst (2013), among others. He is an Honorary Life Member of both the National Speleological Society and the International Society for Subterranean Biology, and a member of the Explorers Club. Tanja Pipan received her Ph.D. in 2003 in Biology from the University of Ljubljana. She is currently Research Advisor at ZRC SAZU Karst Research Institute and Associate Professor of Biology at University of Nova Gorica. She has research interests in the biology of shallow subterranean habitats, ecology of the epikarst copepod fauna, patterns of subterranean biodiversity, and karst ecosystem function. She is largely responsible for the recognition of epikarst as a significant subterranean habitat. She has published over 50 papers and has authored thee books. Pipan is country coordinator for the International and European Long Term Ecological Research Program. In 2016 she received the ZRC SAZU Gold Award: a prize for outstanding scientific research.