Michael A. Dirr is a professor of horticulture at the University of Georgia. He is the author of twelve books, including Dirr's Hardy Trees and Shrubs: An Illustrated Encyclopedia and the text and reference book, Manual of Woody Landscape Plants, and has published more than 300 scientific and popular papers and articles. His teaching, lectures, seminars, garden study tours, and plant introduction programs have contributed enormously to greater horticultural awareness. He has received the highest teaching and gardening awards from the University of Georgia, American Society of Horticultural Science, American Horticultural Society, American Nursery & Landscape Association, Massachusetts… Horticultural Society, Southern Nursery Association, and Garden Club of America.