Charles Shackelford, PhD, PE

Professor & Head

Charles D. Shackelford is Professor and Head of the Department of Civil and Environmental Engineering, Colorado State University, Fort Collins, Colorado, USA. He has 28 years of experience pertaining to the geoenvironmental aspects of waste management and environmental remediation, is a registered professional Civil Engineer in California and Colorado, and has served as an expert on waste disposal issues on numerous occasions for private companies and federal agencies. Dr. Shackelford's research is focused primarily on evaluating flow and transport of hazardous liquids and contaminants through soil and geosynthetic containment barriers, such as compacted clay liners (CCLs) and geosynthetic clay liners (GCLs), commonly used in geoenvironmental containment applications (e.g., landfills, surface impoundments, lagoons, secondary containment of above-grade fuel storage tanks, etc.), as well as through soil-bentonite (SB) vertical cutoff walls used for in situ control and containment of polluted groundwater. His most significant contributions have related to characterizing diffusion of potential contaminants through these barrier materials. Dr. Shackelford has served as an Editor for both the ASCE Journal of Geotechnical and Geoenvironmental Engineering, and the Journal of Hazardous Materials published by Elsevier, Amsterdam, and currently serves as an Editorial Board Member of Geotextiles and Geomembranes, also published by Elsevier, and as an Associate Editor of the Canadian Geotechnical Journal published by the National Research Council, Ottawa, Ontario, Canada. He also was past chair of the Geoenvironmental Engineering Committee (GEC) of ASCE's Geo-Institute, and past co-chair for the Environmental Geotechnics Committee TC215 of the International Society of Soil Mechanics and Geotechnical Engineering (ISSMGE), and currently is still a member of both the GEC and TC 215. He also served as a member and the chair of ASCE Geo-Institute's Awards Committee, as a member of the Technical Coordination Council (TCC) of ASCE's Geo-Institute, and was an elected Board Member of the U. S. University Council on Geotechnical Education and Research (USUCGER). Dr. Shackelford was elected to the Academy of Civil Engineers at his alma mater, the Missouri University of Science and Technology, in April of 2005. Dr. Shackelford's career contributions to the field of Environmental Geotechnics have recently been recognized through his receipt of the inaugural (2013) R. Kerry Rowe Honorary Lecture for Environmental Geotechnics by the ISSMGE. Professor Shackelford was elected as a Fellow of the American Society of Civil Engineers in 2015. His MS and PhD degrees are from the University of Texas at Austin in 1983 and 1988, respectively.

Dr. Bareither

Christopher Bareither, PhD, PE

Assistant Professor & Program Coordinator

Dr. Bareither is an Assistant Professor of Civil and Environmental Engineering at Colorado State University. His expertise is in Geotechnical and Geoenvironmental Engineering. His education is all within the field of Geological Engineering; he received a BS from University of Idaho (2004) and MS (2006) and PhD (2010) from University of Wisconsin-Madison. Following his PhD, he was an Instructor and Research Associate at University of Wisconsin-Madison. Dr. Bareither's graduate research at UW focused on the mechanical properties of geomaterials. His MS research focused on geological controls on the shear strength of naturally occurring sands and gravels. This work yielded relationships between geologic origin, material characteristics, and shear strength parameters. The Wisconsin Department of Transportation has adopted his recommendations as standard practice for evaluating shear strength of backfill materials. Dr. Bareither's PhD research coupled physical and biological mechanisms controlling municipal solid waste compression in bioreactor landfills. His research has helped progress the state-of-the-art in experimental evaluation of municipal solid waste, and also develop predictive tools for sustainable solid waste management. Dr. Bareither's future research initiatives will focus on scale effects in laboratory testing, scale effects between laboratory and field processes, mechanisms of geomaterial behavior, and sustainable solutions to geoengineering problems.


Joseph Scalia, PhD

Assistant Professor

Areas of Research: environmental containment systems (water-balance covers, geosynthetic clay liners, contaminant-resistant bentonites) , hydro-mechanical behavior of energy and mine wastes, clay behavior (including mitigation of expansive soils and clay-polymer composites), unsaturated terramechanics

Education: PhD & MS, Geological Engineering, University of Wisconsin-Madison; BS, Civil & Environmental Engineering, Bucknell University. Prior to joining CSU, Dr. Scalia was a Senior Associate at Exponent Inc. in the Environmental and Earth Sciences Practice in Seattle and Boston.

Thomas  Siller, PhD

Associate professor

Areas of Research: engineering education, geotechnical engineering, K-12 STEM education

Education: PhD, Civil Engineering, Carnegie Mellon University; MS, Civil Engineering, Univeristy of Massachusettes at Amherst; BS, Civil Engineering, State University of New York at Buffalo

Prior to returning to the Department of Civil & Environmental Engineering, Dr. Siller was an Associate Dean in the CSU College of Engineering.