Dr. Peter J. D'Adamo is an internationally-acclaimed naturopathic physician, researcher, and lecturer, as well as the author of the New York Times best-selling Eat Right 4 Your Type book series. His extensive research and clinical testing of the connections between blood type, health, and disease has garnered world-wide recognition and led to groundbreaking work on many illnesses. The world-famous immunulogist, Dr. Gerhard Uhlenbruck of the University of Cologne, Germany, has called Dr. D'Adamo "one of the most creative scientists in the Western world."

Catherine Whitney is the coauthor of numerous bestselling books on health and wellness.