My primary research interests are the effects of aging on many aspects of cognitive functioning, including memory, reasoning, and spatial abilities. I am interested both in the factors responsible for age-related declines, and in the role of experience and knowledge in moderating the consequences of those declines. The major project in our laboratory is the Virginia Cognitive Aging Project, which is a large cross-sectional (N > 5100) and longitudinal (N > 2700) study of cognitive functioning in healthy adults between 18 and 99 years of age.