Robert H. Mohlenbrock taught botany at Southern Illinois University Carbondale for thirty-four years, retiring with the title of Distinguished Professor. Mohlenbrock has been named SIU Outstanding Scholar and has received the SIU Alumnus Teacher of the Year Award, and the AMOCO Outstanding Teacher Award. Since 1984, he has been a monthly columnist for Natural History magazine. Among his forty-four books and more than five hundred publications are Macmillan’s Field Guide to North American Wildflowers, Field Guide to the U.S. National Forests, and Where Have All the Wildflowers Gone?