The Person Perception Program investigated how we extract, process and use information about other people. These abilities are critical to guiding everyday social interactions. Subtle cues to identity, gender, ethnicity, age, attractiveness, emotional state and focus of attention are effortlessly read from the face, body and voice. The focus of our research was on understanding the perceptual, cognitive, neural and evolutionary mechanisms underlying this impressive expertise, how these mechanisms emerge through development, and how these mechanisms might develop and function differently in people with neurodevelopmental disorders.