ARY L. GOLDBERGER, M.D., is a graduate of Harvard College and Yale Medical School. He is currently Associate Professor of Medicine at Harvard Medical School and Director of the Margret and H.A. Rey Institute for Nonlinear Dynamics in Physiology and Medicine at Beth Israel Deaconess Medical Center. He is also the Program Director of the NIH/NCRR Research Resource for Complex Physiologic Signals. Dr. Goldberger and his colleagues are internationally recognized as pioneers in the application of concepts from the branch of the basic sciences called nonlinear dynamics (“chaos theory”) to basic physiology and bedside medicine. His recent work has also focused on the dynamics of human creativity and on health and disease in complex organizations.