James A. "Jim" Duke, Ph.D, Economic Botanist and Ethnobotanist, retired after a full career with the United States Department of Agriculture in 1995. After "retiring" he served 5 years as senior science adviser with Nature's Herbs. Currently he teaches Medical Botany as adjunct professor with the Master of Sciences Program in Herbal Medicine at the Tai Sophia Institute, Laurel, MD. He often hosts tours of his own Green Farmacy Garden in suburban Maryland, with some 300 medicinal herbs.