The focus of my research is the manner in which individuals influence one another’s perceptions and behaviors, particularly in terms of health behaviors. I examine the social support benefit of positive interpersonal relationships and exchanges. In addition, I consider how negative interpersonal interactions are an important source of stress that can lead to depressed mood, as well as harmful, stress-induced behaviors, such as excessive and/or solitary alcohol consumption. To investigate these associations, I employ daily process methodology and multilevel modeling to examine the role of daily interpersonal exchanges and moods in alcohol consumption. I am exploring these processes in college student and community samples.