Davis is a compass for the study of the brain, facial expressions, and psychopaths, defends Dr. Freitas-Magalhães, Ph.D., the world's leading expert for Neuroscience and Biobehavioral Psychology and the Encyclopedia of Human Behavior, by Elsevier, Oxford, in his pioneering and extraordinary book about an emotional dialogue with Mark Davis, Ph.D., at the 2nd World Congress on Facial Expression of Emotion (WCFEE) on October 9, 2024 at University Fernando Pessoa (UFP), Porto, Portugal.