Mark Doerschlag is a Registered Geologist and Certified Engineering Geologist in California with over 35 years of experience in engineering geology. He leadsthe design, management, and execution of complex site characterizationinvestigations for a wide range of projects, including residential and commercialdevelopments, schools, hospitals, mining operations, and major infrastructurethroughout California and Nevada.

Mark has played a key role in high-profile geo-engineering projects, includinginvestigations for two of the three dams at Diamond Valley Reservoir in RiversideCounty, as well as large-diameter tunnels in both hard and soft rock, deep shafts,and pipeline systems. His work is grounded in a deep understanding of geologicrisk and constructability across challenging environments.His technical expertise includes seismic hazard analysis, liquefaction evaluation,fault investigation, geomorphology, applied geophysics, and rock massclassification for underground construction. He also has extensive experienceevaluating sites affected by hydrocollapse and other complex geologic conditions.

Mark earned his Bachelor of Arts in Geology from the University of California,Berkeley. He is an officer of the Inland Empire Chapter of the Association ofEngineering and Environmental Geologists and regularly serves as a subjectmatter expert for the California Board of Professional Engineers, Land Surveyors,and Geologists.

Outside of work, Mark enjoys exploring the mountains and deserts of Californiaand is an avid world traveler, often leading family and friends on adventures throughout Latin America, the Far East, and Australia.

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