I am primarily interested in social-cognitive aspects of the structure and change of attitudes and stereotypes, ecological interactions with psychological variables, factors in the psychology of health promotion, and the theory and practice of research synthesis (a.k.a. meta-analysis, which amounts to doing empirical history of research phenomena). I also have a strong interest in the history of social psychology. Ongoing projects include (a) an NIMH-supported project, Syntheses of HIV & AIDS Research Project (SHARP), which is a series of meta-analyses evaluating the efficacy of HIV prevention interventions as a function of both intervention features and aspects known about the geographical area in which the study was conducted; (b) methods to reduce depression ranging from medicine to exercise; (c) a series of studies examining attitudes from various competing theoretical perspectives, including prominent judgment/decision making models.