TIM TAKKEN PhD is a medical physiologist and associate professor in pediatrics at the Wilhemina Children’s Hospital of the University Medical Center Utrecht, the Netherlands and the Princes Maxima Center for Pediatric Oncology, Utrecht, the Netherlands. He is a PI in the Child Health focus area and has a special interest in clinical pediatric exercise physiology. He hosted several international meetings in Utrecht, including the European Workshop on Clinical Pediatric Exercise Testing and the 29th Pediatric Work Physiology Meeting. He is currently director of the Clinical Exercise Testing Laboratory in Utrecht. Further he is board member of CPX International and chair of the Dutch chapter of CPX International. Dr Takken published over 250 peer-reviewed papers and authored 4 books.