Martine M. Savard
Geological Survey of Canada, Canada 
The N cycle - an anthropogenic global issue examined at regional scale through the prism of stable isotopes

Martine M. Savard received her Ph.D. in 1991 from University of Ottawa where she specialized in stable isotope geochemistry applied to the evolution of sedimentary carbonate rocks. Martine joined the Geological Survey of Canada (GSC) in 1990, applied her expertise to the study of Pb-Zn carbonate-hosted deposits and proposed new methods of exploration for this type of deposits. She is adjunct professor at INRS-ETE where she has supervised over 20 graduate students. Martin Savard is the head of the Delta-Lab, a stable isotope laboratory that she now dedicates to addressing environmental issues and exploring the applicability of clumped isotopes in carbonate sequences.

On solving environmental issues, Martin and her team have addressed several socio-economic questions such as the sustainable development of groundwater resources in Eastern Canada, and distinguishing natural and anthropogenic contaminants in air, soils and water. She is now pursuing research on tree-ring geochemistry to reconstruct changes of air quality and soil chemistry in industrial centers, and past hydric regimes near major hydropower centers. Savard has been the leader of several multi-institutional and inter-disciplinary projects. She was the main organizer of several international thematic sessions and symposia over the years.

Isotopic communication across the water - rock interface: Preservation in solids and signatures in moving fluids

Jennifer is an Assistant Professor in the Department of Geology at the University of Illinois Urbana-Champaign.  She joined the faculty in 2015 after completing an NSF postdoctoral fellowship at Stanford University.  She holds a Ph.D. from the University of California Berkeley Department of Earth and Planetary Sciences and an M.S. from the University of Arizona Department of Hydrology and Water Resources.  Her research centers on the relationship between the physical heterogeneity and chemical reactivity of aquifers, and ways in which stable isotope ratios are sensitive to this relationship.

Jennifer Druhan
University of Illinois Urbana-Champaign, USA 
Nathaniel R. Warner
 Pennsylvania State University, USA
The geochemical and environmental issues related to oil and natural gas production from shale and tight reservoirs

Nathaniel Warner is currently an Assistant Professor at Pennsylvania State University in the Department of Civil and Environmental Engineering. Previously, Dr. Warner received a BA from Hamilton College where he majored in Geology, an MS in Hydrogeology from Miami University in Oxford, Ohio and a PhD in Earth and Ocean Sciences from Duke University. He was the Joseph B Obering Postdoctoral Fellow, Dartmouth College, Department of Earth Sciences from 2013-2015. Hiscurrent research focuses on using B, Sr, and Ra isotope geochemistry to better understand the processes controlling 1) salinization of freshwater 2) the fate and transport of metals in oil and gas produced waters once released to the environment, and 3) treatment technologies for oil and gas produced waters. Dr. Warner’slab group hasused Sr and Ra isotopes to trace the accumulation of metals associated with oil and gas wastewaters in both sediment and freshwater bivalves. His work has been published in Proceedings of the National Academy of Sciences-USA, Environmental Science and Technology, Applied Geochemistry,GeochimicaetCosmochimicaActa, Chemical Geology, and Environmental Science: Processes and Impacts. Dr. Warner’s paper “Impacts of Shale Gas Wastewater Disposal on Water Quality in Western Pennsylvania” was awarded the Best Article 2013 from the Science from Environmental Science and Technology Editorial Board.

The geochemical and hydrological issues related to Iron Mountain, California, especially the extremely low pH mines-drainage brines

Charlies Alpers is a Research Chemist with the U.S. Geological Survey’s California Water Science Center in Sacramento, California. He has an undergraduate degree in Geological Sciences from Harvard University (1980) and a Ph.D. in Geology from the University of California, Berkeley (1986). Dr. Alpers has authored or coauthored more than 125 peer-reviewed publications on various topics related to the environmental legacy of historical mining, including: acid mine drainage; sulfate minerals; mercury contamination and bioaccumulation; and arsenic speciation and bioavailability. His current projects include quantification of erosion and sediment sources at Malakoff Diggins State Historic Park in Nevada County, California; investigation of mercury transport, methylation, bioaccumulation, and the effects of wildfire in Cache Creek, Yolo County, California; and geochemistry and mineralogy related to extreme mine drainage (including negative pH) at the Iron Mountain Mine Superfund Site in Shasta County, California.

Charles N. Alpers
 U.S. Geological Survey, USA
George A. Chelnokov
 Far East Geological Institute FEB RAS, Russia
Current status and management for the sustainable groundwater resources on Far East of Russia

Dr. George A. Chelnokov, Far East Geological Institute Far East Branch of Russian Academy of Sciences, Head of the Natural-anthropohenic systems Department, Chief of the Laboratory of Hypergene Processes Geochemistry.

George Chelnokov is a hydrogeochemist with over 20 years research experience into various aspects of the geochemistry of fluid-rock interactions. The focus of his scientific work is on understanding of geochemistry and genesis of the different types of groundwater fluids of the Far East of Russia, and on environmental aspects associated with the exploitation of groundwaters. The researches are aimed at obtaining new data on the composition and origin of groundwater and associated gases, solving geothermal energy issues, estimating the balneological properties of natural objects.     

Unusual fractionation of mercury isotopes in surface environments

Jiubin Chen is at the Institute of Surface-Earth System Science (ISESS) of Tianjin University (China). He completed an undergraduate degree in Earth science in the Changchun Institute of Geology in China. He earned both his Master (DEA) and PhD degrees at the Institut de Physique du Globe de Paris, University Paris 7 (France), where he studied the geochemistry of metal isotopes (Zn, Fe, Cu) in river system, and this was followed by a post-doc at Trent University (Canada) on Hg isotopes. He then worked in the Institute of Geochemistry, Chinese Academy of Sciences (IGCAS) in Guiyang (China). Currently, he studies the geochemistry of metal isotopes, focusing on methodology development, fractionation mechanisms and experiments, and potential applications to different environments. He has developed methods for purifying Zn, Hg, and Ga from geological matrices for precise isotope analysis for tracing pollution sources and for understanding the biogeochemical cycling of metals.

Jiubin Chen
Tianjin University, China