Dr. Johnson is a Professor of Weed Science in the Department of Botany and Plant Pathology at Purdue University. He has statewide responsibilities for weed science research and extension in agronomic crops, and he teaches a graduate level Weed Biology course on campus. Dr. Johnson has extensive experience in the biology and management of herbicide-resistant weeds and crops, and interactions between weeds and other plant pests. Dr. Johnson is a Past President and Fellow of the North Central Weed Science Society (NCWSS). He has won Outstanding Extension Specialist Awards from Purdue University, CropLife America, and the Weed Science Society of America. He has published nearly 200 peer reviewed manuscripts and over 100 extension publications.  He has trained 33 graduate students, three post-doctoral research associates, and currently has an additional 4 students currently working on MS or Ph.D. degrees in Weed Science.