James A. Duke, Ph.D., is the author of several books on the healing power of plants, including the bestseller The Green Pharmacy (more than one million copies in print). He retired from the U.S. Department of Agriculture in 1995, after serving as chief of the Medicinal Plant Resources Laboratory. He remains active in ReNuPeru, a medicinal herb garden in the Peruvian Amazon that's maintained by the Amazon Center for Environmental Education and Research. His own garden is on a 6-acre farmette in Fulton, Maryland, where he lives with his wife, Peggy.