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Broadly speaking, I am interested in how intelligence and human cognition change over the life span. My research interests are more focused at understanding how genetic and psychological factors impact adult cognitive development. My collaboration with Denis Gerstorf, Sherry Willis and Warner Schaie on the Seattle Longitudinal study aims to understand what factors are indeed contributing to cognitive decline. We are also investigating if cognitive decline can be observed in midlife for individuals with known risk factors for dementia, such as APOE-e4, as well as if certain personality traits and well-being may moderate decline for those with APOE e4 risk.