Maarten B. Rookmaaker (MD, PhD) is Nephrologist at the University Medical Center (UMC) Utrecht, the Netherlands, with special interest in genetic and developmental disorders. He did his residency training in Internal Medicine and his renal fellowship training at the Utrecht University, the Netherlands. His PhD training about endothelial progenitor cells in renal regeneration was done in both Utrecht as well as Kurume, Japan. He is Director of the Nephrology Fellowship program and member of the guideline committee of the National Federation of Nephrology. His research focus includes renal stem cells and regeneration.