Peter van Hasselt is head of the Department of Metabolic Disease, University Medical Center Utrecht. Peter does translational research the ultimate aim of which is to create 'better care for the rare', particularly for inherited metabolic diseases. Elucidating the genetic cause ('towards a diagnosis for the undiagnosed') is an important research theme. For known treatable disorders his work searches to improve early recognition and/or preventive measures. For vitamin K deficiency he currently works on 'lipids based nanoparticles for oral delivery'. Finding novel disease markers and a better description of the natural disease course is a current interest, particularly for CLN3 disease. His work covers Inborn Errors, Nutritional Biochemistry, Pathology for Pediatric diseases.