This study investigated integrative complexity toward research and teaching in a sample of scientists (99 full professors of physics, chemistry, and biology). Findings from objective, observer, peer, and self-report data suggested that although scientists who think complexly about research are seen by others as hostile and exploitative, are rated by peers as eminent, and have their work frequently cited, scientists who think complexly about teaching are seen by others as warm and gregarious and are not well cited by their peers. Furthermore, these relationships were moderated by scientific discipline, with physicists differing from biologists. Discussion focuses on the relationship between personality and environment in general, and in particular on whether integrative complexity may be stable within, rather than between, situations. "Science is by its very nature a cognitive act!" (Tweney, 1989, p. 345).The essence of science is finding and solving problems. Yet, it has only been since the mid-to late 1970s that cognitive psychologists have applied their skill and trade systematically to the analysis of either "on-line" or simulated scientific thought processes (