Dr Breen received a BSc(hons) in Sport and Exercise Physiology from Manchester Metropolitan University in 2006 and subsequently an MSc in Exercise Physiology in 2007 from the same institute. from 2007-2010, Dr Breen undertook a PhD in Exercise Nutrition and Metabolism in The School of Sport, Exercise and Rehabilitation Sciences at The University of Birmingham. After PhD completion, Dr Breen worked in The Department of Kinesiology at McMaster University, Canada, as a Post-Doctoral Research Fellow in the field of ageing musculoskeletal metabolism. Dr Breen re-joined The School of Sport, Exercise and Rehabilitation Sciences as an academic in January 2013 to establish a world-leading research group studying musculoskeletal metabolism in health and disease.
Dr Breen is a regular speaker at international conferences and a peer reviewer for highly respected scientific journals in his research field. In 2011, Dr Breen was awarded a Young Investigator of the Year award by the European College for Sports Sciences for research investigating the influence of protein nutrition and endurance exercise on skeletal muscle metabolism.