Ronald Klatz is a leading authority on anti-aging medicine. He is the physician founder and President of the American Academy of Anti-Aging Medicine Inc. a nonprofit medical organization dedicated to the advancement of technology to detect, prevent, and treat aging-related disease and to promote research into methods to retard and optimize the human aging process. Dr. Klatz has also co-founded the National Academy of Sports Medicine, which provides medical specialty training in musculoskeletal rehabilitation, conditioning, physical fitness, and exercise to 35,000 health care professionals internationally. He is a bestselling author of several books, including Grow Young with HGH and Ten Weeks to a Younger You.

Robert Goldman, MD, is a physician and surgeon who also holds a doctorate in steroid biochemistry. He is cofounder, with Dr. Ronald Klatz, of the American Academy of Anti-Aging Medicine, which has thousands of members in more than 37 countries, and, also with Dr. Klatz, of the National Academy of Sports Medicine. He is also coauthor, with Dr. Klatz, of Death in the Locker Room and Stopping the Clock. He lives in Chicago, Illinois.