Frits Rosendaal is professor of Clinical Epidemiology at the Leiden University Medical Center. He has a long standing track record in research in thrombosis and haemostasis, with many publications in leading biomedical journals. He designed several studies, such as LETS and MEGA, that were instrumental in the identification of a series of risk factors for thrombosis, which ranged from genetic factors to environmental ones, particularly related to drug safety, such as specific brands of oral contraceptives. In the field of anticoagulant treatment he developed the method used to estimate the time in therapeutic range (TTR). In the field of haemophilia, he oversees the Haemophilia in the Netherlands national projects, and is involved in studies of inhibitor development, again in the context of drug safety.
He is recipient of the Spinoza award, which is the highest scientific prize in The Netherlands, is elected fellow of the Royal Academy of Arts and Sciences in the Netherlands, and of the German Academy Leopoldina, and received an honorary doctorate from the University of Paris Descartes. He was chairman of the Netherlands Society on Thrombosis and Haemostasis and of the Council of the International Society on Thrombosis and Haemostasis. He is Editor in Chief of the journal of Thrombosis and Haemostasis. He is member of the Council of the Committee on Publication Ethics (COPE), and chairman of the Leiden University Committee on Scientific Integrity. He founded the ECTH.