Professor Alan Lambert conducts research on the expression versus suppression of stereotypes. A primary goal of his research is to understand how aspects of the "situation," the perceiver's personality, as well as transitory mood states (e.g., happiness versus sadness) might lead people to either use-or avoid using-stereotypic knowledge as a basis for responding to others. In addition to his work on stereotyping, he is interested in the processes underlying perceptions of risk and self-vulnerability.