Professor Reis 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. In his research, subjects keep detailed records on their on-going social interaction. These are tabulated by computer and related to various factors such as sex role, health, and emotional well-being.
Professor Reis 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.