Mariëlle Kloosterman is a MD-PhD student who started doing research at the Atrial Fibrillation Research group of Prof. van Gelder and dr. Rienstra during the second year of her Bachelor. She completed the University of Groningen Honours program and received her Bachelor of Science in Medicine in 2014. In 2016 she officially started a MD-PhD programme at the Department of Cardiology, allowing her to combine the Master phase with a PhD training to obtain a MD and PhD degree upon completion. Part of her research concentrates on markers to predict and assess response to cardiac resynchronization therapy (MARC study). She also focuses on the association between heart failure and atrial fibrillation, the two most common cardiac disorders afflicting or society today. She is the study coordinator of the BIOWOMEN study.