Dr. Gregory MacDonald has been with University of Florida Institute of Food and Agricultural Sciences Center for Aquatic and Invasive Plants (UF/IFAS CAIP) for over 25 years, including his time in graduate school at the University of Florida. Dr. MacDonald received his bachelor's from Cornell University and his master's and Ph.D. from the University of Florida. Before starting as a faculty member at UF, Dr. MacDonald was an Assistant Professor at the University of Georgia with a 100 percent extension appointment. He managed over 20 commodities, including several fruits, vegetables, corn, cotton, and sorghum. He worked with extension agents across the state and gave 20-80 extension presentations every year. Dr. MacDonald became interested in invasive species because the challenges of managing weeds in natural areas was different than traditional agronomy and row crops. Dr. MacDonald teaches and specializes in Introductory Weed Science, Herbicide Physiology, Crop Production, and Tropical Crop Production.