Bastiaan Geelhoed is bioinformatician, with a background as scientist in the theory and practice of material sampling, and an author of several scientific publications in international journals. From 1998 to 2004 Bastiaan conducted scientific research at The Delft University of Technology and at the Camborne School of Mines (University of Exeter). In 2004, he successfully defended his PhD thesis entitled “Sampling of Particulate Materials – A New Theoretical Approach” at The Delft University of Technology. After gaining industrial experience in various projects he continued his scientific research at the University of Sussex from 2005 to 2007. Since 2007 he has continued his research, at the Delft University of Technology (until 2011), into the generalisation and extension of the theory of sampling. In 2012, he started as bio-informatician in the atrial fibrillation research group of dr. Rienstra, and is responsible for all genetic analyses within PREVEND and other cohorts. He is also the representative of the atrial fibrillation research group within the AFGen Consortium, and involved in all ongoing collaborative projects. He is also responsible for all bioinformatics (e.g. latent class clustering) and statistical analyses in the PREVEND and MARC studies.