Leo Leonhart received his bachelor’s in geology from Youngstown State University, a master’s in water resources from Ohio State University, and his doctorate in watershed hydrology from the University of Arizona. He is a registered geologist and certified hydrogeologist, practicing as Principal Hydrogeologist at Hargis + Associates in Tucson. He is adjunct faculty at the Department of Hydrology and Water Resources at the University of Arizona and the University of Phoenix. His professional experience spans over four decades in hydrogeologic investigation, and he has been project director of the Apache Powder Superfund project for most of its lifetime.