Other people are boundless sources of social information. We form impressions based on their appearances, their faults, their virtues, and their preferences -- and we can do so based upon incredibly thin slices of experience. However, thin-slices don't always tell the whole story and expectations are often violated. As such, our impressions are continuously revised and recontextualized in light of multiple channels of social information. Our work takes a multi-level approach to uncover the social cognitive and neural mechanisms that underlie how we dynamically perceive, evaluate, and understand other people, leveraging theory and methods from cognitive neuroscience, experimental social psychology, perceptual psychophysics, and computational modeling.