Mike is a Professional Geologist in California with more than 12 years of experience working on projects related to slope stability, erosion, and sedimentation issues as well as groundwater investigations and runoff analyses.  He poseses a range of technical skills both as a field scientist and as a GIS analyst and numerical modeler.



Michelle is responsible for accounts processing, insurance and other administrative duties.




OEI was founded in 1996 by Dr. Matt O'Connor to provide a broad range of hydrogeologic consulting services to both private and public-sector clients throughout California and the Pacific Northwest.  We specialize in stream restoration, flood hazard mitigation, hydrologic and hydraulic modeling, watershed planning, surface and groundwater availability analysis, and fluvial and hillslope geomorphology.  The small size of our company and our specialized areas of expertise ensure a level of experience, communication, and project dedication that sets us apart from our competition. 

Jeremy is a Certified Floodplain Manager in California and a Registered Geologist in Oregon.  He is an expert in the development and application of numerical hydrologic, hydraulic, and sediment transport models including HEC-RAS, MODFLOW, HSPF, GSSHA, MIKE SHE, MIKE 11, MIKE 21, and MT3DMS.  Jeremy has more than 12 years of experience working on a diverse range of projects pertaining to habitat restoration planning and design, flood hazard mitigation, and water supply investigation.


Matt is a Professional Geologist and a Certified Engineering Geologist in California and Washington.  He is a regional expert in fluvial and hillslope geomorphology, hydrology and hydrogeology with more than 22 years of experience leading investigations pertaining to the analysis of land management influences on hydrologic and erosion processes, water resources, and stream restoration.  In addition to his technical capabilities, Matt's excellent communication and project management skills make him am invaluable asset to any project team. 




Dr. Matt O'Connor
Principal Hydrogeologist & Geomorphologist
Jeremy Kobor
Senior Hydrologist
Mike Sherwood
Senior Geologist
Michelle Nelson
Office Administrator
Hydrology - Geomorphology - Engineering Geology