Jon Karlsson is Professor of Orthopaedics and Sports Traumatology at the Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden. Originally from Iceland, he has worked at Sahlgrenska University Hospital since 1981. His clinical focus is knee sugery, expecially complex knee injuries, knee dislocations and revision surgery. He is also involved in Foot & Ankle surgery, hip surgery, muscle & tendon repair/reconstructive surgery, as well as trauma care. His PhD-thesis in 1989 was devoted to ”Chronic Lateral Ankle Instability”, and since then he has been the author of more than 600 peer-reviewed publications, more than 150 book chapters and over 40 textbooks in Orthopaedics and Sports Traumatology. He was executive Board Member of ISAKOS between 2005 and 2019. He is regular lecturer at the IOC Advanced Team Physician Course. He has mentored 70 PhD-students at the Sahlgrenska Academy. He is currently (since 13 years) the chief Editor of KSSTA (Knee Surgery Sports Traumatology Arthroscopy), the official journal of ESSKA. He has a past position as Associate Editor of Scandinavian Journal of Medicine and Science in Sports (SJMSS), (1997-2003) and Arthroscopy (2003-2008). He has been the care-taking physician of a profssional football club (IFK Göteborg) since 1984.