Dr. Cullen completed her medical training at the University of Minnesota including medical school, psychiatry residency and child/adolescent psychiatry fellowship. She also completed a T32 research fellowship through the Center of Neurobehavioral Development. She currently co-directs the Early Stage Mood Disorders (child and adolescent arm) clinic with Dr. David Bond, and co-directs the Research on Adolescent Depression laboratory (RAD Lab) with Bonnie Klimes-Dougan, Ph.D. (Psychology). Dr. Cullen is an active member of the Center for Neurobehavioral Development and the Institute of Engineering in Medicine, and is has an adjunct appointment in the Graduate Program for Neuroscience.