Dr. Nicholas L. DePace is board certified in cardiology, echocardiography, internal medicine, lipidology, and nuclear cardiology, with nearly forty years of clinical practice experience in cardiovascular and autonomic medicine. He was trained at Mount Sinai Medical School and Columbia University in New York, and Hahnemann Hospital in Philadelphia. He runs practices in the greater Philadelphia area. He is professor of medicine and former associate chief of cardiology, with affiliations at local area hospitals.

Dr. Joseph Colombo is trained in neurology with a background in electrical and mechanical engineering. His doctorate from University of Rochester, NY, is in neuroscience and biomedical engineering. He currently serves as chief technology officer and senior medical director of Physio PS, Inc.; and parasympathetic and sympathetic nervous system consultant at Franklin Cardiovascular Associates, PA. He is licensed as a Doctor of Natural Medicine and a Doctor of Humanitarian Services. He has coauthored or ghostwritten numerous journal articles, book chapters, and books.