He is professor in pediatric hematology/oncology at the department of Pediatrics, Aarhus University Hospital Skejby in Aarhus, Denmark.
He received his doctor of medicine degree from Odense University, Denmark.
He trained in epidemiology, hematology and pediatrics at Odense University Hospital, where he also completed a research fellowship in pediatric oncology with a thesis on myelodysplastic syndrome.
Since 2000, he was consultant and associate professor in pediatric hematology/oncology at Aarhus University Hospital Skejby in Aarhus Denmark and was subsequently awarded full professor in 2009.
He is a founding member of the European Working group on Myelodysplastic Syndromes in Childhood (EWOG-MDS) and served as chairman of the group 1998-2002.
He was the chairman of the AML group of the Nordic Society for Pediatric Hematology and Oncology (NOPHO) 2002 to 2010 and continues as responsible for the data managing of the NOPHO-AML protocols.
He is the chairman of the International-BFM-AML group from 2016.
He is the author or coauthor of more than 210 peer reviewed journal articles mainly dealing with myeloid leukemia in children, genetic predisposition to cancer, and late effects after cancer therapy.