As a clinical neuropsychologist, cognitive neuroscience researcher, and clinical trialist, Dr. Leavitt develops mechanistic models of cognition utilizing MRI, fMRI, and EEG. She has developed and validated several cognitive measures and scales, including digital tools currently being tested in 12 countries on 5 continents. A major focus of her research is understanding the contribution of lifestyle factors such as exercise, psychological factors, and social support to cognitive health and brain health, as well as differences in brain reserve and resilience related to sex as a biological variable. Her laboratory has been continuously funded by grants from the National Institutes of Health, the United States Department of Defense, and the National Multiple Sclerosis Society.