in particular, reis investigates psychological processes that affect interpersonal relationships, intimacy, and attachment. his studies address gender and sex factors, dating variables, perspectives on partner responsiveness, principles of familiarity, and perceptions of similarity and dissimilarity. much of his research is informed by his subjects’ detailed, daily records of social activity. his research has been funded by the national science foundation, the national institute of mental health, the national heart, lung and blood institute, israel science foundation, and the fetzer institute. he was a fulbright senior research scholar in 1991.