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<br />06/11 <br /> <br /> <br /> <br /> <br />Jon Wren, Ph.D., P.E. <br />Practice Director and Principal Engineer <br /> <br />Professional Profile <br /> <br />Dr. Jon Wren is a Principal Engineer and Exponent’s Civil Engineering Practice Director. <br />Dr. Wren has over 17 years of experience in geotechnical and earthquake engineering. His <br />expertise includes analysis, design, and performance of retaining structures, foundations, <br />embankments, natural and manmade slopes, dams, levees, and pipelines. Dr. Wren has <br />experience with urban and infrastructure construction including site characterization, deep <br />foundations such as drilled shafts and piles, and excavation analysis and design. His expertise <br />includes deep foundation testing, excavation monitoring, groundwater monitoring and <br />withdrawal effects, and the effects of deep excavations on nearby structures. He provides peer <br />review services for design of complex structures and activities such as nuclear power plant <br />structures, deep excavations, and dewatering programs. <br /> <br />Dr. Wren has investigated retaining wall and foundation performance and failures including <br />retaining structures such as crib retaining walls, soil mix retaining walls, soil nail walls, and <br />conventional gravity and cantilever retaining structures. Dr. Wren also has experience in the <br />investigation and analysis of pipeline system performance and failure, including sanitary sewer <br />pipelines, water supply pipelines, storm drain pipelines, and irrigation pipeline systems and is <br />knowledgeable about the documentation methods for operational pipeline systems. Dr. Wren <br />has expertise in dynamic soil properties and testing, analysis of the behavior of retaining <br />structures, slopes, foundations, and pipelines during earthquakes and has evaluated sites and <br />structures following natural disasters, such as earthquakes and floods, including the Loma <br />Prieta, Northridge, San Simeon, and Hawaii earthquakes. <br /> <br />Dr. Wren has also investigated and analyzed landslides on natural and manmade slopes and <br />provided repair recommendations for slope failures. He has investigated and analyzed the <br />factors contributing to the causes of landslides in varied geologic settings across the United <br />States. Dr. Wren has expertise in the behavior of expansive and collapsible soils and their <br />effects on foundations, retaining walls, and slopes. His expertise includes investigation of <br />structures affected by ground settlement, conducting subsurface investigations of these sites, and <br />performing analyses of the causes of the settlement and appropriate remedial measures. He has <br />experience with geotechnical laboratory testing including static and dynamic testing of soil and <br />soil improvement technologies such as soil mixing, jet grouting, and compaction grouting. <br /> <br />Dr. Wren has served as a Lecturer and Teaching Assistant in the Civil and Environmental <br />Engineering Department at Stanford University, a part-time faculty member in the Department <br />of Civil Engineering and Applied Mechanics at San Jose State University, and as an instructor <br />for the U.S. Army Corps of Engineers. He currently serves on the Industrial Advisory Board for <br />the University of California Los Angeles (UCLA). <br />