I have 40 years of experience and specialize in the field of applied geology, groundwater, contamination, construction applications, landslides, civil engineering, sanitary landfills, highways and petrography with specific knowledge in the areas of landslides, sanitary landfills and construction problems. I have published on such topics as engineering geology, groundwater and landslides. I have testified 10 times on topics such as landslides, sanitary landfills and construction problems.