Dr Takken received his M.Sc. in Exercise Physiology from the Faculty of Human Movement Sciences of the Vrije University in Amsterdam in 1998. He received his Ph.D. from the Faculty of Medicine of Utrecht University in 2003.
Dr Takken competed in road cycling at a national level for 20 years and was member of several semi-professional teams.
He is currently director of the Clinical Exercise Testing Laboratory at the UMC Utrecht . Dr Takken published over 150 peer-reviewed papers and authored 4 books including the title “Cycling & Science”. He is member of the North American Society of Pediatric Exercise Medicine, American College of Sports Medicine, European Workgroup on Pediatric Work Physiology, the European Association for Cardiovascular Prevention and Rehabilitation, and he is chair of the Dutch Chapter of CPX International.