After completing his undergraduate (BSc Sport and Exercise Sciences, University of Birmingham, UK; 1997-2000) and masters studies (MSc Exercise Physiology, Loughborough University, UK; 2000-2001), Dr Wallis worked in applied sports science delivering physiology support for high performance athletes (Human Performance Unit, University of Birmingham; 2001-2002). He went on to complete a PhD focused on exercise metabolism and carbohydrate ingestion in men and women at the University of Birmingham (UK; 2003-2006) under the guidance of Professor Asker E. Jeukendrup. Between 2006 and 2008 he undertook post-doctoral training in integrative biology at the University of California-Berkeley in the laboratory of Professor George A. Brooks. Dr Wallis then worked in New Product Research at GlaxoSmithKline (UK; 2008-2011), within a scientific program developing new nutritional products and health claims with a particular emphasis on sport and exercise nutrition. He joined the School of Sport, Exercise and Rehabilitation Sciences at the University of Birmingham at the end of 2011 where he conducts research and teaching in the area of exercise metabolism and nutrition for the optimization of sports performance and health. In April 2021 Dr Wallis was appointed to the role of Head of Research and Knowledge Transfer of School of Sport, Exercise and Rehabilitation Sciences at the University of Birmingham.