Mike Edmunds: fifty years of water, rock and interaction

For almost 50 years Mike Edmunds pursued an accomplished and influential career in hydrogeochemistry. His research interests covered the gamut of groundwater quality issues ranging from the effects of acid rain on upland streams to the origin of deep basin brines, and spanned the globe. Almost from the start of his career he was involved with the IAGC's Water–Rock Interaction (WRI) Working Group, becoming a founding father of the triennial WRI symposia which commenced in 1974 and continue to this day. Mike was a geologist turned chemist but also, crucially, a ‘people person’. This combination of qualities created a tireless advocate for the subject of water–rock interaction in all its variety.