Dr. Mohammad Pessarakli, PhD, is a well-known, internationally-recognized scientist and scholar. He is a professor in the School of Plant Sciences, College of Agriculture and Life Sciences, University of Arizona, Tucson, Arizona. He received his BS (1977) in environmental resources in agriculture and MS (1978) in soil management and crop production from Arizona State University, Tempe, and earned his PhD (1981) in soil and water science from the University of Arizona, Tucson. Dr. Pessarakli is a certified professional agronomist and a certified professional soil scientist (CPAg/SS), as designated by the American Registry of the Certified Professionals in Agronomy, Crop Science, and Soil Science.