I have 27 years of experience, and specialize in the field of geotechnical and environmental engineering with specific knowledge in the areas of landfills, groundwater and soil contamination and mining. I have published on such topics as landfills and environment, mining wastes and environment, groundwater and soil remediation. I have testified 15 times on topics such as landfill environmental performance, groundwater contamination and geotechnics and geosynthetics.