Paul L. Younger (PhD C.Geol. C.Eng.) is HSBC Professor of Environmental Technologies at the University of Newcastle, United Kingdom, where he directs water research within the Institute for Research on Environment and Sustainability, and is also a Director of the leading groundwater control contracting company, Project Dewatering Ltd. His groundwater engineering experience spans more than 20 years and six continents, ranging from hand-digging water wells with indigenous communities in the Americas, through sophisticated numerical modelling of pollutant migration in aquifers, to the design of novel remediation systems for extremely contaminated groundwaters.