Dennis Johnson is a professor and Extension plant pathologist at Washington State University. He received a BS degree in botany from Brigham Young University and MS and PhD degrees in plant pathology from the University of Minnesota. Dr. Johnson was an assistant plant pathologist at Texas A&M University, where he did research on diseases of small grains at the Texas Agricultural Experiment Station in Vernon. In 1980, he began working for Washington State University (WSU) at the Irrigated Agriculture Research and Extension Station in Prosser, where he specialized in epidemiology and management of diseases of potato, mint, onion, asparagus, hops, and sweet cherries. He transferred to the main WSU campus in 1993, where he teaches a graduate class in plant epidemiology and disease management and continues research and Extension activities on diseases of mint and potato. His research has been directed at developing practical disease management strategies.