Dr. Marshall grew up in Zambia and in different parts of the UK (parts where the rain comes at you sideways). As his dreams of becoming a professional cyclist faded, he completed a bachelor’s degree in Sports Science at Liverpool Polytechnic (UK), followed by a master’s degree in kinesiology from SDSU. He returned to the UK in 1998 to complete a PhD in exercise psychology, followed by a post-doctoral fellowship in physical activity and public health. From 2002-2012, he served as professor of exercise and nutritional sciences at SDSU. In addition to his faculty role at UCSD, Dr. Marshall serves as associate director of UCSD’s Exercise and Physical Activity Resource Center (EPARC) in the Center for Wireless and Population Health Systems. He has over 16 years of experience in designing and implementing methods for measuring and evaluating physical activity. Since 2004, Dr. Marshall’s externally funded research has focused predominantly on physical activity and exercise promotion in the Latino community. He served as principal investigator (PI) for Pasos Adelante, a Spanish language physical activity program funded by the Centers for Disease Control and Prevention (CDC), and he currently serves as PI for Academia Fit, a CDC-funded translation study of supervised, grouped-based exercise classes offered in public parks and recreation centers. He has authored over 60 articles and book chapters on physical activity and sedentary behavior, and serves on the editorial board of the International Journal of Behavioral Nutrition and Physical Activity. When not working he tries to keep up with his professional triathlete wife, Lesley Paterson, who continually reminds him that exercising in San Diego is as close to paradise as it comes.