He is the Federal Medical Officer of the Swedish Football Association since 2003 and has been a federal physician for the women's U23 national team since 2008. Lennart has a major sporting interest, which led to his training in orthopedics, where he specialized in sports medicine and sports injuries.He is one of IFK Gothenburg's physicians since 2012. Lennart has also been active in football and in-band players.
Research interests include sports injuries, orthopaedic surgeries.