I have 45 years of experience and specialize in the field of environmental chemistry with specific knowledge in the areas of sampling, analysis and quality assurance/quality control (QA/QC). I have published on such topics as environmental sampling and analysis, the importance of documenting data quality objectives and working safely with hazardous chemicals. I have testified 10 times on topics such as the reliability or unreliability of analytical data, development of analytical methods and using US EPA quality requirements during analysis.