PhD, Associate professor, Section of Sport Science, Dep.Public Health, Aarhus University, Denmark. He is an exercise physiologist specialized in rehabilitation of neurological patients. In particular most of his research focuses on the efects of exercise therapy in subjects with multiple sclerosis (MS). His main research covers the efects of diferent exercise modalities (e.g. resistance training and endurance training) and aspects of exercise therapy related to selected groups of MS patients (e.g. thermo-sensitive patients or fatigued patients). Much of his ongoing research focuses on understanding the efects of exercise on brain function, and he is trying to determine, whether long-term exercise is a disease modifying intervention in MS. Currently, he is board member and secretary for the European organization Rehabilitation in Multiple Sclerosis (RIMS). Finally, he has authored about 70 scientifc papers and several book chapters including a contribution to the revised Recommendations on Rehabilitation Services for Persons with MS