Professor Robert Kleck has research interests in nonverbal communication (encoding and decoding of affect-related expressive behavior and its relationship to physiological and social outcomes), interpersonal attraction and expressive behavior, and the effects of physical appearance on social interaction. His recent research, done largely in collaboration with Reginald Adams and Ursula Hess, has focused on facial changes associated with aging and the implication of these changes for how emotions are perceived in the elderly.