ALFRED R. CONKLIN, PhD, is currently a professor in the Agriculture and Chemistry Departments of Wilmington College, Wilmington, Ohio, and has also been a Fulbright Professor at the University of Zimbabwe and Leyte State University in the Philippines. In addition to his extensive academic experience teaching about soils and organic chemistry, Dr. Conklin has served as an adviser on soil conservation projects in Africa and has worked on several agricultural production activities with Fifth Third Bank, Petro Environmental Technology, and the Peace Corps. He also participated in a GTI Superfund site cleanup. Dr. Conklin is a referee and contributor to several publications and the author of a number of prior books on soil science and organic chemistry.