Don Ahrens is an emeritus professor at Modesto Junior College in Modesto, California. He has influenced countless professionals in the field of atmospheric science as well as hundreds of thousands of students who use his books to better understand weather and climate. In 2007, the National Weather Association awarded him a lifetime achievement award for these accomplishments. The best-selling author of three Cengage texts -- METEOROLOGY TODAY, ESSENTIALS OF METEOROLOGY and EXTREME WEATHER AND CLIMATE -- Professor Ahrens received the Textbook and Academic Authors Association's McGuffey Longevity Award for the 9th edition of METEOROLOGY TODAY. Professor Ahrens completed his bachelor's and master's degrees in meteorology at San Jose State University and his doctorate at the University of Northern Colorado.