Jack V. Matson, Ph.D., is emeritus professor of environmental engineering at The Pennsylvania State University and an owner of Matson and Associates Inc., a litigation support consulting engineering firm, in State College, Pennsylvania. His expertise is in the field of chemical emissions, water and wastewater treatment, air pollution, and hazardous wastes. In the course of his career, he has been deposed in over 100 cases and testified at 20 trials. He continues to be active as an expert witness in environmental litigation, specializing in chemical emissions. He is a registered professional engineer in Pennsylvania, Texas, and Ohio.