Susan L. Brantley serves as the Distinguished Professor of Geosciences in the College of Earth and Mineral Sciences at Pennsylvania State University (USA) where she is also Director of the Earth and Environmental Systems Institute. Dr. Brantley and her research group investigate geo­logical, chemical, biological, and physical processes

associated with the circulation of aqueous fluids in the critical zone by using field, laboratory, and theoretical approaches. She is a fellow of the American Geophysical Union, the Geological Society of America, and the Geochemical Society. In 2012, she was elected to membership in the US National Academy of Sciences. She received an AB in chemistry in 1980 and an MA and a PhD in geological and geophysical sciences in 1983 and 1987, respectively, from Princeton University (USA).

Laurent De Windt is a researcher in applied geo­chemistry in the Geosciences Department at MINES ParisTech (France), one of the oldest French higher education institutions for engineering. Before that he spent five years in the French institute for radio­logical protection and nuclear safety (IRSN). Laurent received his MS in chemistry from FUNDP

University (Belgium) and his PhD in physical chemistry from Pierre and Marie Curie University (France). His research activities focus on reactive transport modeling of geomaterial durability and radionuclide migration in radioactive waste disposals. He also works on hierarchical materials for water decontamination and on environmental impacts of mineral waste management.

Donald J. DePaolo is the Graduate Professor of Geochemistry and Chancellor’s Professor Emeritus at the University of California at Berkeley (USA), a senior advisor at the Lawrence Berkeley National Laboratory (USA), and a 2018 Cox Visiting Professor at Stanford University (USA). He received his PhD from the California Institute of Technology (USA)

in 1978, and, after being on the faculty at the University of California at Los Angeles, moved to UC Berkeley. His research involves the use of isotope and trace element measurements in fluids and rocks, combined with analytical and numerical models, to understand the rates and consequences of mineral–fluid interactions in a range of subsurface environments, including rock and soil weathering, CO2 storage, marine carbonate diagenesis, hydrothermal systems, and metamorphism.

Jennifer L. Druhan is an assistant professor in the Department of Geology at the University of Illinois Urbana­Champaign (USA). She joined the faculty in 2015 after completing a National Science Foundation postdoctoral fellowship at Stanford University (USA). She holds a PhD from the Department of Earth and Planetary Sciences at the

University of California at Berkeley (USA) and an MS from the Department of Hydrology and Water Resources at the University of Arizona (USA). Her research centers on the relationship between the physical heterogeneity and chemical reactivity of aquifers and the ways in which stable isotope ratios are sensitive to this relationship.

Yves Goddéris is a senior researcher at the Géosciences Environnement Toulouse (GET) labora­tory, part of the Centre national de la recherche scientifique (CNRS, France). Together with col­leagues at GET, he works on reconstructing deep­time geochemical cycles, focusing on the coupling between continental weathering processes, tec­

tonics, and the long­term evolution of Earth’s climate. He is particularly interested in the causes of major glaciations in Earth history. He also explores how the critical zone functions by using numerical models of weathering processes at the scale of watersheds. Yves Goddéris received his degree in physics in 1991 and his PhD in geophysics in 1997, both from the University of Liège (Belgium). He was awarded the Bronze Medal of the CNRS in 2007.

Anna L. Harrison is a Marie Skłowdowska­Curie Research Fellow at University College London (UK). After receiving her PhD in geological sciences from the University of British Columbia (Canada) in 2015, she was a postdoctoral scholar at Stanford University/Stanford Linear Accelerator Center (USA) and a National Sciences and Engineering Research

Council postdoctoral fellow at the CNRS Géosciences Environnement Toulouse laboratory (France). Anna investigates the chemical and physical controls on mineral–fluid reaction rates, including the use of reactive transport models, and applies these fundamentals to issues of environmental concern, such as CO2 sequestration and element cycling in both natural and disturbed environments.

Benjamin D. Kocar is a biogeochemist and hydrolo­gist with over 18 years of experience examining the physical, chemical, and biological factors that govern the fate, transport, and transformation of nutrients, contaminants, and trace gases in the environment. He has designed and executed field and laboratory studies for understanding water

movement and chemical migration in soils, wetlands, aquifers, and natural waters, and employs groundwater and geochemical modeling tools to understand and predict their flux across complex geologic set­tings. He has also used numerous conventional and advanced analytical tools to detect, quantify, and fingerprint aqueous and solid­phase con­stituents, including metal(loid)s, nutrients, and trace gases.

TOPICS RELATED TO REACTIVE TRANSPORT MODELING

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Kate Maher is an associate professor of Earth system science at Stanford University (USA). Kate has an MS degree in civil and environmental engi­neering and a PhD in Earth and planetary sciences from the University of California at Berkeley (USA). Her primary research focuses on the application of reactive transport models to investigate a diverse

array of questions, such as the evolution of Earth’s subsurface environ­ments and their links to the carbon cycle, subsurface storage of CO2, and water quality in dynamic hydrologic systems.

K. Ulrich Mayer is a professor of hydrogeology at the University of British Columbia (Canada). He obtained his PhD from the University of Waterloo (Canada) in 1999, which involved the development of the reactive transport code known as MIN3P. His current research focuses on the use of reactive transport modeling to advance process under­

standing in a variety of fields relevant to the Earth sciences, including the generation and attenuation of acid rock drainage, the long­term geochemical stability of deep sedimentary basins and shield rocks, the natural attenuation of petroleum hydrocarbon spills, gas migration related to leaky well bores, and the interactions between plants and soil.

Christof Meile is a professor in the Department of Marine Sciences at the University of Georgia (USA). He completed his undergraduate at the Swiss Federal Institute of Technology in Zurich (Switzerland) in environmental sciences, received his MS in Earth and atmospheric sciences from the Georgia Institute of Technology (USA) and earned his PhD from the

Faculty of Earth Science at Utrecht University (The Netherlands). His interests lie in understanding and modeling biogeochemical cycling in near­surface environments, ranging from deep­sea sediments and seeps to coastal settings and tropical soils.

Henning Prommer is a research professor with the School of Earth Sciences at the University of Western Australia (UWA) and a principal research scientist at the Commonwealth Scientific and Industrial Research Organisation’s Land and Water department (Australia). He received his diploma in engineering from the University of Stuttgart

(Germany) and his PhD from UWA. He develops and applies reactive transport models to a wide range of groundwater quality issues. He has a strong interest in integrating hydrological, geochemical, and micro­biogical datasets to quantify redox processes and the interlinked fate of organic and inorganic pollutants at both the laboratory and field scale.

Timothy D. Scheibe is a laboratory fellow at the Pacific Northwest National Laboratory (USA) where he has worked since 1992. He received his PhD from Stanford University (USA) in civil engineering. His current research focuses on the impacts of river–groundwater interactions on the biogeochemistry in river corridors and watersheds. Other areas of

interest include microbial transport in groundwater systems, linking microbial models with reactive transport simulations, geological carbon sequestration, and multiscale simulation of coupled flow, transport, and biogeochemistry. He has served as the National Ground Water Association’s 2010 Henry Darcy Distinguished Lecturer, in which role he presented 65 invited lectures across North America and Europe.

Jacques Schott is Directeur de Recherche Centre national de la recherche scientifique Emeritus at the Observatoire Midi­Pyrénées (France). His PhD thesis (Toulouse University, France) was devoted to the chemical and isotopic fractionations that are induced in natural systems by thermal diffusion. Since then, his primary research area has been the

experimental and theoretical determination of the thermodynamics and kinetics of mineral–fluid interactions and the application of this to modeling reactive transfer within the Earth’s crust (and at the sur­face) at different spatial and temporal scales. Jacques’ recent field of interest is the characterization of the kinetics and equilibrium frac­tionation of novel isotope proxies during solid­solution interactions (dissolution, sorption, precipitation) as a function of solid and aqueous metal speciation and their reaction affinities.

Nicolas F. Spycher is a researcher in geochemistry at the Lawrence Berkeley National Laboratory (USA). Nic obtained his BS and MS degrees from the University of Geneva (Switzerland) and his PhD from the University of Oregon (USA). His research activities focus on the development of conceptual and numerical models that will clarify water–gas–

rock interactions in subsurface environments. Nic has contributed to a range of studies dealing with coupled (bio)geochemical, hydrological, and thermal processes related to nuclear waste disposal, geothermal systems, carbon geologic storage, groundwater contamination, and ore deposits. He also contributed significantly to the development of the modeling codes TOUGHREACT and SOLVEQ/CHILLER.

Jing Sun is a research fellow in the School of Earth Sciences at the University of Western Australia (Australia). Jing received her PhD in biogeochem­istry from Columbia University (USA). Her research centers on redox chemistry in soil and aquifer sys­tems, with a current focus on the role of iron cycling and mineralization on the environmental

fate of toxic metal(loid)s. She integrates laboratory experiments, field experiments, analytical techniques, and reactive transport models to examine the type and rates of redox reactions that occur at the inter­faces between mineral surfaces, water, and microorganisms, and to design remediation strategies.

Benjamin M. Tutolo is an assistant professor at the University of Calgary (Canada). He received his BS in 2010 from Pennsylvania State University (USA) and his PhD from the University of Minnesota (USA) in 2015. From 2015 to 2017, he worked as a postdoctoral research associate at the University of Oxford (UK). Ben has a wide range of research inter­

ests, including the geologic capture, utilization, and storage of CO2 and the lacustrine geochemistry and hydrothermal processes associated with ultramafic rocks. The driving questions that unite Ben’s research revolve around the reactive transport of fluids, solutes, and heat in geologic systems. To answer these questions, he integrates physical and chemical characterization of laboratory, outcrop, and drill­core samples with thermodynamic, kinetic, and fully coupled reactive transport models.

Matthew J. Winnick is an assistant professor of geosciences at the University of Massachusetts Amherst (USA). He holds a BA from Vassar College (USA) and received his PhD from Stanford University (USA) in 2015. His research centers on the use of stable isotope geochemistry and reactive transport models to investigate how terrestrial water and

carbon cycles are linked, both in the modern Earth and during key intervals in Earth’s history.

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