**About the Editors**

**John Eichelberger**'s career spans volcanology, geothermal energy, natural hazards, and international Arctic education. Educated at MIT and Stanford, he was on the research staff at the Los Alamos National Laboratory 1974–1979 and Sandia National Laboratories 1979–1991, New Mexico. He then moved to University of Alaska Fairbanks (UAF) when he was appointed Professor of Volcanology and led the Alaska Volcano Observatory (AVO). Sixteen years later, he became Program Coordinator for the Volcano Hazards Program of the U.S. Geological Survey, Reston, VA. He returned to UAF in 2012 as Dean of the Graduate School and Vice President Academic of University of the Arctic. John is best known for discoveries concerning mixing and degassing of magmas, leadership in scientific drilling, and advocacy of international collaboration in natural hazards. In 2015, this advocacy was formally recognized when he received the Sergey Soloviev Medal from the European Geosciences Union. He is now Professor Emeritus at UAF, based at the International Arctic Research Center.

**Alexey Kiryukhin** Education: 1974–1979: St. Petersburg Mining Institute (Candidate of Science, Hydrology, 1984); 1977–1981: St. Petersburg University, Mathematics; 1993: Institute of Earth Crust, SB RAS, Doctor of Science, Hydrogeology and Professor in 2001. Positions: Institute of Volcanology (IV) Far East Branch Russia Academy of Sciences, Engineer, Staff Scientist of the Geothermal and Geochemistry Department (1979–1995), Deputy Director (Science) (1996–2004), Chief Scientist, Head of the Laboratory of the Heat and Mass Transfer (2004–); 1991, 1998, 2001–2002: Geological Scientist, Earth Sciences Division, Lawrence Berkeley National Laboratory (LBNL). Research: Focused on heat and mass transfer, geofluids mechanics studies in volcanic areas. Developed methods of analysis for conditions of hydrothermal systems for exploitation. Proposed geomechanical models of magma injections beneath active volcanoes and methods of identification of their magma feeding systems based on seismic data. Established a relationship between strong earthquakes and thermohydrodynamic perturbations in hydrothermal systems. Demonstrated the CO2 gas-lifting mechanism of geyser activity. Piip Award 2010 (volcanology and seismology) of the FEB RAS for "Modeling and Experimental Study of Heat and Mass Transfer Processes in Volcanic Areas".

**Silvio Mollo** has served as Professor of Petrology at the Department of Earth Sciences of Sapienza University of Rome in Italy since 2015. He studied at the Department of Sciences of the University of Roma Tre, where he concluded his Ph.D. in 2008. Afterward, Dr. Silvio Mollo was employed as a researcher at the National Institute of Volcanology and Geophysics in Rome until 2015. His research concerns experimental petrology, magma dynamics related to fractional crystallization, assimilation and mixing, trace element partitioning, isotope geochemistry, equilibrium and disequilibrium cation exchanges between crystals and melts, thermobarometric and hygrometric modeling, and the physicochemical properties of rocks and fluids.

**Noriyoshi Tsuchiya** has served as Professor at the Graduate School of Environmental Studies, Tohoku University, since 2004. He studied at the Department of Resources Engineering at Tohoku University and became a research assistant after having finished his Ph.D. in 1988. He participated in the 31st Japanese Antarctic Research Expedition (1989–1990) and in the 35th Japanese Antarctic Research Expedition (199–1994). In 2009–2010, Professor N. Tsuchiya was expedition leader of Earth Scientific Research Party of the Sør Rondane Mountains, East Antarctica, as part of the 51st Japanese Antarctic Research Expedition. He studies water–rock interactions involving geothermal and metamorphic fluids under various crustal situations. He also carries out hydrothermal experiments for understanding the interactions between rock and subcritical and supercritical geofluids. He is now a board member of the Japanese Association for Petroleum Technology, Geothermal Research Society of Japan, Society of Resource Geology, and Japanese Association of Mineralogical Sciences. His current fields of study are geothermal and resource geology as well as environmental geology.

**Marl `ene Villeneuve** is a rock engineer with experience with tunneling, geomechanics, and drilling in a variety of settings ranging from the European Alps to New Zealand volcanoes as well as to deep geothermal systems in New Zealand and Iceland. She received her education at Queen's University, Canada, where she was awarded her PhD in Geological Engineering in 2008. She was Associate Professor at Canterbury University, New Zealand, becoming Chair of Subsurface Engineering at Montanuniversitat Leoben, Austria, in 2020. Her particular focus is on exploring the ¨ nexus between geological history, properties, and rock mass behavior. She uses engineering tools to help geologists describe and understand geological processes while also using geological tools to help engineers better predict rock mass behavior for engineering projects. This has allowed Dr. Villeneuve to work from the tops of 2700 m tall volcanoes to 2500 m deep tunnels and everywhere in between.
