Prof. Dr (DScV, DMV) D. Marlier is Professor at the Faculty of Veterinary Medicine, Department of Veterinary Management of Animal Resources, of the University of Liège, Belgium, and Head of the Poultry, Rabbit and Racing Pigeon Medicine Service. His clinical, teaching, and research activities focus on preventive health management, sustainable production systems, and performance medicine. His current work is mainly dedicated to the development of sustainable poultry production systems, particularly in low-resource settings, and to the study of the relationship between homing ability and sporting performance in racing pigeons.