Harry T. Reis is Professor of Psychology at the University of Rochester. He studies the factors that influence the quantity and closeness of social interaction, and the consequences of different patterns of socializing for health and psychological well-being. He is also investigating some of the psychological processes that affect the course and conduct of close relationships. He is particularly interested in intimacy, attachment and emotion regulation. He is well-versed in the field, having served as editor of its leading journal, Journal of Personality and Social Psychology, having recently edited The SAGE Encyclopedia of Human Relationships, and having served as president of both the… world's largest organization of social psychologists (Society for Personality and Social Psychology) and the world's pre-eminent organization devoted to researching relationships (International Association of Relationship Research).