Steven Chapman is a Senior Research Engineer/Hydrogeologist in the G360 Centre for Applied Groundwater Research in the School of Engineering at the University of Guelph. He is a Professional Engineer (Civil) with an M.Sc. from the University of Waterloo (Earth Sciences) and has more than 20 years of hydrogeologic experience. His research focuses on contaminant behavior in unconsolidated porous media and sedimentary rock, involving high resolution site characterization at industrial and research sites and numerical modeling, with a focus on the role of diffusion including impacts on remediation performance.