Meyer Friedman, M.D., the discoverer of Type A behavior and its relation to heart disease, is director of the Meyer Friedman Institute, University of California San Francisco-Mount Zion Medical Center. In addition to his voluminous medical publications, he has written the bestsellers Type A Behavior and Your Heart and Treating Type A Behavior and Your Heart. Gerald W. Friedland, M.D., is professor emeritus in the department of radiology at the Stanford University School of Medicine and the author of many books and articles dealing with radiology, anatomy, embryology, physiology, and the history of medicine.