Mark Borchardt, Ph.D. is a Research Microbiologist for the USDA-Agricultural Research Service in the Environmentally Integrated Dairy Management Research Unit. Prior to this position, he was a Research Scientist for 15 years at the Marshfield Clinic Research Foundation. His published research involves the areas of groundwater-borne viruses, methods of pathogen detection in the environment, and human health as related to drinking water and sanitation. In his new position, Dr. Borchardt is investigating solutions for mitigating the environmental transmission of pathogens found in livestock manure. Dr. Borchardt served on the drinking water, homeland security, and state of the environment committees of the US Environmental Protection Agency Science Advisory Board. He currently serves as an advisor for the Green Tier Program of the Wisconsin Department of Natural Resources.