Asker Jeukendrup is considered a leading expert in the general areas of sport nutrition, training and overtraining and recovery. He is a registered sport and exercise nutritionist and has worked with several elite athletes and clubs around the world, including Chelsea FC, FC Barcelona and UK Athletics. Michael Gleeson is a professor of exercise biochemistry in the School of Sport, Exercise and Health Sciences at Loughborough University. Gleeson is considered a world authority on exercise biochemistry, immunology and nutrition. He has worked with numerous world-class athletes and professional football clubs.