**About the Editors**

**Giovanni Ruggieri** holds a Ph.D. in Mineralogy and Petrology and was awarded the Johndino Nogara prize of the Italian Society of Mineralogy and Petrology. He is a researcher at IGG-CNR and a member of the Commission on Ore Mineralogy of the IMA. He coordinates the participation of CNR in the EU H2020 project GEMex. Specialized in fluid inclusions, stable isotopes, hydrothermal alteration and minero-petrographic studies, his fields of interests include geothermal exploration, fluid-rock interactions and fluid flow in hydrothermal systems, ore genesis, travertine formation, CO2 sequestration by serpentine carbonation, and experimental mineralogy.

**Fabrizio Gherardi** received his PhD from the University of Pisa, Italy, defending a dissertation on gas-water-rock interactions and fluid geochemistry of high-enthalpy geothermal systems. A geochemist with a background in isotope hydrology, fluid geochemistry and gas-water-rock interactions, he uses numerical models to investigate geochemical reactivity in natural and anthropogenically disturbed systems. His recent research focuses on noble gas geochemistry, geochemical and reactive transport modelling of gas-water-rock interactions in hydrothermal/geothermal systems, and sites for geological confinement of greenhouse gases.
