Dr. James Hopker is a Reader in Exercise Physiology, Director of Postgraduate Research, and Acting Head of School for the School of Sport and Exercise Sciences at the University of Kent. He is an expert on exercise training, and he has been studying applications of performance monitoring in anti-doping. We discuss how an Athlete Performance Passport may complement the Athlete Biological Passport, the role of technology in performance monitoring, and strengths and limitations of this approach in anti-doping.