The question of whether religious conversion causes changes in someone's personality is examined in light of two bodies of literature-the research on personality change and the research on conversion. When the theory and research on personality change is applied to the question of whether conversion causes such change, the answer depends on what level of personality is of concern. Research on the relation between religious conversion and a variety of behavioral, attitudinal, emotional, and lifestyle variables is consistent with this conclusion. Although conversion seems to have minimal effect on elemental functions such as the Big Five traits or temperaments, it can result in profound, life transforming changes in mid-level functions such as goals, feelings, attitudes, and behaviors, and in the more self-defining personality