**About the Editors**

**Peter Dillon** is a research engineer who led teams on groundwater quality protection and water recycling in CSIRO Land and Water from 1985 to 2014. He is the author or co-author of 150 journal papers and 200 reports, and has edited nine books or journal Special Issues largely on MAR. He was a founding co-chair of the IAH Commission on Managing Aquifer Recharge, from 2001 to 2019, and co-founded the Australian Water Association's Water Recycling Special Interest Group, and is a Fellow of Engineers Australia. He has supervised 24 postgraduates, run 25 MAR training courses in 14 countries and also consults. His research interests include: hydrogeology; water quality protection; stormwater management; water recycling; and water policy.

**Enrique Fern´andez Escalante** has a major interest in hydrogeological interventions, especially for managed aquifer recharge (MAR) and has implemented projects in 16 countries during his 30 years of professional experience. While his activity is more directed to the practical deployment of MAR systems than in academia, he does have research interests including related aspects of environmental hydrogeology, unsaturated zone studies and integrated water resources management (IWRM). Dr. Escalante has been a co-chair of the IAH MAR commission since 2014. He is the author, co-author or editor of 27 books, most of which are MAR-related, and more than 60 peer-reviewed articles. Dr. Escalante also teaches a Masters course at the Technical University of Madrid. Over many years he has been or currently serves as a member of 18 competitive R&D projects on IWRM and MAR, including as a coordinator for four of these.

**Sharon B. Megdal** holds a Ph.D. in Economics from Princeton University and is the Director of the Water Resources Research Center at the University of Arizona, USA. She also serves as a Professor, at the Department of Environmental Science, a C.W. & Modene Neely Endowed Professor, and a Distinguished Outreach Professor. Dr. Megdal works at geographic scales, ranging from local to international, and her research efforts include the comparative evaluation of water management, policy, and governance in water-scarce regions, aquifer recharge, and transboundary aquifer assessment. As the author of many articles, she is also the editor of Shared Borders, shared Waters: Israeli–Palestinian and Colorado River Basin Water Challenges and multiple special journal issues. Dr. Megdal teaches the multi-disciplinary graduate course "Water Policy in Arizona and Semi-Arid Regions".

**Gudrun Massmann** is a professor at the Carl von Ossietzky University, Oldenburg, where she has led the Hydrogeology & Landscape Hydrology group since 2010. The research interests of the group include the fate of organic trace pollutants in groundwater, managed aquifer recharge, surface water–groundwater interaction, coastal hydrogeology and ecohydrology. She has co-authored 79 peer-reviewed journal papers that that are well cited (¿2000 citations with a corresponding h-index of 26 based on theWeb of Science) and is presently involved in projects dealing with water recycling, groundwater salinisation following sea-level rise, the fate of freshwater lenses in view of climate change and the biogeochemistry of subterranean estuaries.
