is a geotechnical engineering consultant specializing in reinforced soil and other ground improvement technologies, geosynthetic application and design, and geotechnical testing and instrumentation. He has a BSCE from UNC, Charlotte, MS from Northwestern, and a Ph.D. from Purdue University. He is a registered professional engineer in several states, is a certified National Highway Institute instructor, and has over 30 years of national and international experience.

Dr. Christopher has authored over 100 technical papers, nine design manuals, a textbook, and several book chapters. He has designed, evaluated, instrumented and/or supervised the construction of numerous earth retaining structures. He is a principal consultant for the HITEC National Earth Retaining Structures review program. Working with the FHWA, he has helped develop and presented courses nationwide to transportation agencies on MSE walls, reinforced soil slopes, earth retaining structures, soils and foundations, subsurface exploration, and geotechnical instrumentation.