Who We Are

Michael Zinsley P.G., E.G., Principal Engineering Geologist

Mr. Zinsley is a registered professional geologist and engineering geologist with professional experience throughout California, the West Coast, and abroad since 1989.  He has extensive experience in landslide hazard characterization and stabilization, soils and foundation engineering, liquefaction analysis, Alquist-Priolo earthquake fault studies, geological exploration and mapping, and construction observation. Mr. Zinsley has additional experience conducting geophysical surveys and environmental engineering investigations. He has also participated in geotechnical investigations for dams, bridges, highways, railroads, public and private schools, commercial buildings, and private residences and housing tracts. Mr. Zinsley has a Bachelor’s degree in Geology from the University of Colorado, Boulder, with additional graduate studies at California State University, Los Angeles, in education. Notable projects include: Calaveras Dam Replacement Project, Baraka Nuclear Power Plant (UAE), BNSF rail yard (Portland, Oregon), CDWR Feather River Levee Investigation, Alameda Creek Levee Investigation, and the new Vasco Road (Livermore, California). Mr. Zinsley is HAZWOPER certified.  Resume for Michael Zinsley


Mark R. Petersen P.E., G.E., P.G., E.G., Associate Geotechnical Engineer, Associate Engineering Geologist

Mr. Petersen is a registered geotechnical engineer and engineering geologist. Since his first assignment as a field geologist on the Trans-Alaskan Pipeline, Mark has applied his training in earth science and engineering disciplines to projects throughout the Western U.S. and as well as the Arctic, Himalayas, and Middle East.  Mark earned his B.S. degree in Geology from the University of California, Berkeley, and a Master’s degree in Civil/Geotechnical Engineering from San Jose State University.  He has a strong background in site exploration, seismic and geohazard assessment, and foundation design for difficult sites.  His projects have included: geohazard studies; dam and earth structure investigations and construction monitoring; deep and shallow foundations for bridge and multi-story buildings; public works facilities (canals, pipelines, levees, municipal water and wastewater treatment plants); landslide analysis and repair; earth stabilization and retaining structures; forensic studies; transportation facilities (highway, rail, and airports); water and wastewater treatment facilities; and earthquake fault and seismic hazard studies.  He has participated on Value Engineering teams for major water, wastewater, pipeline, and transportation projects.  As a geotechnical specialist for the Federal Emergency Management Agency (FEMA), Mark served as lead of the FEMA Landslide Workgroup during the “El Nino” storms of 1998, where he was responsible for assessing landslide failures throughout California.  Mark teaches geotechnical and earth science college courses and assists with development and grading of licensing examinations given by the State of California for both Geotechnical Engineers and Engineering Geologists.


David Campbell P.G., Senior Project Geologist

Mr. Campbell is a registered geologist with extensive experience as a project manager on major projects in the United States and abroad. He has expertise in groundwater hydrology as well as environmental and geotechnical engineering. Mr. Campbell is a graduate of Clemson University. Mr. Campbell is HAZWOPER certified.


Miles Grant P.G., E.G., Associate Engineering Geologist

Mr. Grant is a registered professional geologist and engineering geologist with professional experience throughout California and Nevada since 1983.  He has extensive experience in environmental and geotechnical engineering projects. His major projects include development of rail lines, highways, airports, bridges, hospitals, and schools. Mr. Grant has a Bachelor’s degree in Geology from the University of California, Santa Cruz, and a Master’s degree in Geology from the University of Southern California. Mr. Grant is HAZWOPER certified.  Resume for Miles Grant


Robert Wilson III P.G., E.G., Associate Engineering Geologist

Mr. Wilson is a registered professional geologist and engineering geologist with professional experience throughout California since 1987.  He has extensive experience in landslide hazard characterization and stabilization, soils and foundation engineering, environmental engineering, construction observation, and AP earthquake fault studies. He also has experience in insurance and forensic investigations. Mr. Wilson has a Bachelor’s degree in Geology from the University of California, Santa Cruz. Resume for Rob Wilson


Michael Carey P.G., E.G., Associate Engineering Geologist

Mr. Carey is a registered professional geologist and engineering geologist with professional experience throughout northern California since 1978.  He obtained a BS in Geology from the University of California at Davis, and has done post-graduate work at UC Berkeley.  Mr. Carey has performed numerous fault hazard investigations and landslide analyses for a variety of projects ranging from single-family homes to large infrastructure projects, located throughout Northern California and in the Sierra.  Additionally, he has vast experience dealing with contractors in the field and conducting field observations of earthwork and density testing of engineered fill.  Clients have included private individuals, engineering firms, attorneys, banks, insurance companies and public agencies. Resume for Michael Carey


Brigid Doran, Senior Geologist

Ms. Doran is a senior staff geologist experienced in site characterization using subsurface exploration and geologic mapping techniques.  Her engineering geology expertise has been applied to critical facilities in a quality assurance environment nationally and internationally.  Ms. Doran also has experience in mineral exploration in the mineral prospecting industry. Resume for Brigid Doran

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