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Our Credentials Dr. Dennis Helsel (PhD, Environmental Science and Engineering, Virginia Tech) has 32 years experience applying statistics to practical issues in environmental sciences. He is the owner and lead scientist of Practical Stats, an environmental statistics training and consulting firm. He is the lead author of two textbooks, Statistical Methods in Water Resources (USGS, 2002), and Nondetects And Data Analysis: Statistics for Censored Environmental Data (Wiley, 2005), as well chapters in two handbooks and over 50 journal articles. Full List of Publications (pdf) Dr. Helsel was a 2003 recipient of the Distinguished Achievement Award from the American Statistical Association's section on Statistics and the Environment, and of the Dept. of Interior's Distinguished Service Award in 2007. He has been invited to conduct training classes on environmental statistics to the Chinese Ministry of Water Resources; to the Umweltbundesamt (German Environment Agency); to students at the Helsinki University of Technology, Finland; and in the United States through the American Statistical Association. Practical Stats employs instructors who hold PhD's in Statistics or Mathematical Statistics, who have extensive experience in environmental statistics, quality control processes, load (mass transport in streams) estimation, statistical methods for groundwater contamination, and have set up technical training programs. We have conducted training courses in the US and overseas since 1990. More information is available upon request. Who Else Has Taken Our Courses? ".An excellent class overall which I will recommend to others"..."I really appreciated your explanations of some common concepts that were previously explained to me in 'foggier' ways"....."I enjoyed the class. Thank you!"......"I learned a lot. This course was very informative and a great refresher." -- students in our October 2001 AES course The list of agencies and organizations sending students to our classes has become quite long. Below is just a sampling of some of them. Several agencies have had us back multiple times, a testimony to the value they have gotten from our work. State and Regional Agencies Southwest Florida Water Management District Oklahoma Secretary of the Environment California Dept. of Water Resources LA Dept. of Environmental Quality Oregon Dept. of Environmental Quality Kansas Dept. of Health and Environment Colorado Dept. of Public Health and Environment Texas Commission on Environmental Quality Washington State Dept. of Ecology Montana Bureau of Mines Utah Division of Water Quality Federal and Tribal Agencies Centers for Disease Control and Prevention (CDC) National Park Service US Army Corps of Engineers US Bureau of Reclamation US Environmental Protection Agency US Fish and Wildlife Service US Geological Survey US Nuclear Regulatory Commission Sac and Fox Nation Pawnee Nation Eastern Shawnee Tribe Companies and Corporations Norwest Corp. Larry Walker Associates S.S. Papadopulos and Associates Apogen Technologies URS Corporation NCASI Exponent, Incorporated Brown and Caldwell Tetra Tech Local Government Agencies New York City Dept.