George J.G. Ruijter, 

 has a PhD in chemistry and is a registered Laboratory Specialist Clinical Genetics at the department of Clinical Genetics, Erasmus Medical Centre, Rotterdam, The Netherlands, since 2006. He is the head of the laboratory for diagnostics of Inborn Metabolic Disorders, which performs screening new patients as well as metabolite analysis in known IMD patients for therapy monitoring using state-of-the-art methods, such as mass spectrometry. In addition, he is responsible for training of biochemical geneticists in the Erasmus MC. He has been involved in External Quality Assurance since 2009 as the Scientific Advisor of the ERNDIM Diagnostic Proficiency scheme. As of 2016 he is member of the ERNDIM Executive Committee and currently chair of the Scientific Advisory Board. His main professional interests are diagnostic test development, novel applications of mass spectrometry such as metabolomics, and biochemistry and treatment of lysosomal storage disorders. He supervises development of metabolomics as a diagnostic tool as well as metabolomics research projects to understand pathology of metabolic diseases and discovery of novel biomarkers. He has published more than 100 papers in peer reviewed international journals and books.