Jon Karlsson is Professor of Sports Traumatology at the Gothenburg University and a former Chair of the Swedish Association of Sports Medicine. He has worked in the field of football medicine for decades, including as care-taking physician at IFK Göteborg for over 30 years. He has also worked as physican for the Swedish national teams at different levels since 1985. His main experience is in the field of traumatology, especially knee and foot and ankle trauma. He is the author (together with Jan Ekstrand and Lars Engebretsen) of the book Football Medicine, published in Swedish, English and Norwegian.