Damien Downing, M.D. , is president of the British Society for Ecological Medicine and editor of the Journal of Nutritional and Environmental Medicine.. He has undertaken pioneering work in the treatment of allergies, the link between behavioral disorders and nutrition, and light therapy and treatment of chronic fatigue, autism, and attention deficit/hyperactivity disorder. Dr. Downing maintains a private practice in the U.K. focusing on nutritional and alternative therapies.