Lelio H. Mejia, Ph.D.
Geosyntec Consultants, Inc.
Senior Principal
Dr. Lelio Mejia is a registered civil and geotechnical engineer with more than 35 years of experience in dam engineering, soil liquefaction, earthquake ground motions, soil-structure interaction, and soil improvement. He is a senior principal with Geosyntec Consultants and leads the firm’s western U.S. dams and levees practice. Lelio has directed the investigations and seismic stability evaluations of more than 25 large earth dams and has been involved in the design and construction of more than 15 major dam projects worldwide. He has served on multiple prestigious technical review boards and expert panels for U.S. federal and state agencies, water and power utilities, and other owners on various dam projects worldwide. Lelio currently serves as chair of the USSD Earthquakes Committee and as a vice chairman of the ICOLD Committee on Seismic Aspects of Dam Design. He was a member of the National Academies Committee for the State of the Art and Practice in Earthquake Induced Soil Liquefaction Assessment, a secretarial appointee to the Advisory Committee on Structural Safety of Department of Veterans Affairs Facilities, and chair of the Governance Board of the National Network for Earthquake Engineering Simulation. Lelio has been a lecturer of geotechnical earthquake engineering and a member of the editorial board for the ASCE Journal of Geotechnical Engineering and was recently elected to the National Academy of Engineering.
Glenn J. Rix, Ph.D., P.E.
Geosyntec Consultants, Inc.
Senior Principal
Glenn J. Rix is a senior principal geotechnical engineer based in Georgia with more than 30 years of experience focused on the areas of geotechnical earthquake engineering and engineering seismology. His practice includes seismic hazard and risk assessment and mitigation for civil infrastructure. Glenn joined the firm following a 23-year career as a professor in the School of Civil and Environmental Engineering at the Georgia Institute of Technology. Since joining Geosyntec, Glenn has performed seismic hazard and risk analyses, liquefaction triggering evaluations, site response analyses, and seismic stability and deformation analyses for embankment and concrete dams, coal combustion residual (CCR) storage facilities, municipal and hazardous waste landfills, liquefied natural gas facilities, and highway bridges. He has also served as an external peer reviewer for seismic hazard analyses for nuclear power plants and provided litigation support for numerous cases related to the effects of blasting- and construction-induced ground vibrations on structures. Glenn is a leading authority on in-situ seismic methods and is a co-author of Surface Wave Methods for Near-Surface Site Characterization and the forthcoming American Association of State Highway and Transportation Officials (AASHTO) Manual on Subsurface Investigations.
Christie Hale, Ph.D.
Geosyntec Consultants, Inc.
Project Professional
Christie Hale is a seismic hazard analyst involved in seismic safety assessment projects. Her technical experience includes deterministic and probabilistic seismic hazard analysis, deaggregation analysis, target spectrum development, and time history selection and modification. Dr. Hale also has experience in PSHA code development, testing, and verification, and is a key contributor to the PSHA computer program HAZ45. Prior to joining Geosyntec, she led the PSHA Code Verification project at the Pacific Earthquake Engineering Research Center, where her ability to understand how different modeling approaches impact the resulting seismic hazard curves was instrumental in helping participants troubleshoot their codes and ultimately reach consensus answers.
