Thomas D. Fahey, Ed.D., is professor of Kinesiology at California State University, Chico, where he teaches Exercise Physiology and Principles of Strength and Conditioning. He also volunteers as an assistant coach with the track and field team. He received his doctorate from the University of California, Berkeley. Dr. Fahey has written college textbooks and trade books on exercise physiology, wellness, athletic training, weight training, personal training, golf, and ergogenic aids. He has also written hundreds of articles for scholarly journals and popular magazines. He is a contributing editor and writes monthly research columns for Muscular Development, Fitness RX for Women and Fitness RX for Men magazines. His interests include travel, skiing, golf, tennis, weight training, hiking, and discus throwing. Dr. Fahey is a world-class masters discus thrower and was an All-American discus thrower in college. He won eleven straight US National Masters Championships, five medals at the World Masters Championships (including world champion in 2003), and three gold medals in the World Masters Games. He is a former competitor in powerlifting, highland games, alpine skiing, and tennis. McGraw-Hill authors represent the leading experts in their fields and are dedicated to improving the lives, careers, and interests of readers worldwide.

Paul Insel, PhD is Clinical Associate Professor of Psychiatry and Behavioral Sciences at the Stanford University School of Medicine. He has been the principal investigator of numerous NIH studies involving health education, mental health, blood pressure, cardiovascular disease and nutrition. He has authored 14 books and more than 100 articles.

Walton T. Roth, M.D., is Professor of Psychiatry and Behavioral Sciences at the Stanford University School of Medicine, and Chief of the Psychiatric Consultation Service at the VA Palo Alto Health Care System. He is author of over 150 research articles about how the body reacts to stress and psychological disorders. His clinical specialties are the treatment of anxiety disorders and psychiatric consultation in the general hospital.