Four to five million Americans are affected currently by dementia and it is the leading cause of institutionalization among the elderly. Approximately 90% of individuals with dementia demonstrate problematic behaviors, such as abrupt vocalizations, aggression, and wandering, in addition to cognitive and functional losses. These individuals also may demonstrate more passive behaviors, such as decreased activity, loss of interest, withdrawal, or apathy which often go unnoticed in long term care settings. There have been claims that individuals with dementia lose themselves; however, theoretical and empirical evidence suggests that individuals with dementia can maintain their sense of self or personhood throughout the dementia process. It is possible that while some changes in personality occur during the progression of dementia, the link between premorbid personality and behavior is retained to a degree that allows some prediction of dementia behaviors from knowledge of premorbid personality traits. This descriptive, correlational study utilized convenience quota sampling from five long-term care facilities in southeastern Minnesota. Demographic data, cognitive status (MMSE), functional ability (FBP), agitation (CMAI), passivity (PDS), and premorbid personality (NEO-PI-R) were gathered from a total of 64 residents. There were statistically significant differences in verbal agitation (F (2, 61) = 3.225, p <.05, η ²= .096), physical aggression (F (2, 61) = 6.141, p < .01, η² = .168), and physical nonaggression (F (2, 61) = 5.242, p < .01, η ² = .147) between people with mild to moderate, moderate to severe, and severe dementia. There were also statistically significant differences in physical aggression (F (1, 62) = 17.074, p < .01, η² = .216), physical nonaggression ( F (1, 62) = 4.496, p < .05, η² = .068), and passivity (F (1, 62) = 4.072, p < .05, η² = .062), between people with high and low functional ability. Results indicate that 3% of the variance in verbal agitation, 38% of the variance in physical aggression, 11% of the variance in physical nonaggression, and 20% of the variance in passivity is accounted for by cognition, functional ability, and personality traits. This study posits that premorbid agreeableness is the one personality trait that may be able to predict physically aggressive and passive behaviors in those with dementia.