He is the Director of the Exercise, Technology, & Cognition Laboratory and an affiliate faculty member of the Beckman Institute and the Illinois Informatics Institute. He is currently funded by the National Heart, Lung, & Blood Institute, and by the Center on Health, Aging, and Disability. He has published 26 scientific journal articles, 2 book chapters, and more than 30 conference abstracts. Mullen’s research focuses on understanding and improving exercise adherence and cognitive performance through the use of technology-delivered interventions among both healthy populations and those with chronic disease and disabilities.