Andrew Binley is Professor of Hydrogeophysics at Lancaster University. His research focuses on the use of near-surface electrical geophysics for hydrogeological characterization. He is the developer of widely used geoelectrical modelling computer codes. In 2012 he was awarded the Frank Frischknecht Leadership Award for his long-term contributions to the field of near-surface geophysics, and in particular hydrogeophysics. This award is jointly presented by the Society of Exploration Geophysicists (SEG) and the Environmental and Engineering Geophysical Society (EEGS). He was elected Fellow of the American Geophysical Union in 2013 for pioneering work on uncertainty modelling and hydrogeophysics. Lee Slater is a Distinguished Professor and the Henry Rutgers Professor of Geophysics at Rutgers University, New Jersey. His research focuses on near-surface geophysics and he has performed extensive laboratory and field studies with resistivity and induced polarization. In 2013 he was awarded the Harold B. Mooney Award for long-term contributions in education and professional outreach in near-surface geophysics by the Society of Exploration Geophysicists (SEG) and the Environmental and Engineering Geophysical Society (EEGS). He was elected Fellow of the American Geophysical Union in 2013 for visionary experimentation in near-surface geophysics.