I am an environmental scientist with focus on water patterns from meteoric waters to surface waters and groundwaters, from quantitative, qualitative and ecological perspectives. I have various experiences in several countries mainly France, Brazil, Switzerland and thus in very various contexts, from alpine to tropical environments, in pristine or strongly urbanized contexts. To study these topics, may main tools are hydrogeochemistry, i.e. water quality, stable isotopes signatures, combined with geological, ecological, geographical knowlegdes. Since 12 years, I valorized these experiences in various consulting and academic missions, e.g. groundwater contamination, groundwater dependent ecosytems study, cartography, functiuning of heterogenous aquifers (i.e. volcanic), surface water dynamics, and atmospherie geochemistry. I valorize these experiences through international publications and expert reviews, and also teached at universitary level and proposed vulgarization to wider audiences. Do not hesitate to contact and we'll see how I can collaborate to your project! Guillaume