She has statewide responsibilities for the Georgia landscape industry and conducts applied research with emphasis on sustainable outdoor and indoor landscapes which includes plant, water, nutrient, and soil interactions.
Dr. Pennisi also teaches online university level courses titled: Herbs, Spices, and Medicinal Plants; along with a Plant Physiology course.
She also teaches Master Gardener training classes on landscape installation and maintenance, WaterSmart landscapes, interiorscapes, herbaceous and woody ornamental plant selection, plant propagation and plant physiology.
Dr. Pennisi serves as educational advisor to the Georgia Green Industry Association (GGIA), the Urban Agriculture Council (UAC), and the national organization Green Plants for Green Buildings (GPGB). She serves on the environmental committee of the National Initiative for Consumer Horticulture (NICH).
Dr. Pennisi is a Co-Editor-in-Chief of Scientia Horticulturae.