His research interests center around the development and implementation of new cardiovascular MR and CT techniques. Dr. Leiner has served as faculty member and member of the organizing committees at the annual meetings of the International Society for Magnetic Resonance in Medicine (ISMRM), European Society for Magnetic Resonance in Medicine and Biology (ESMRMB), Society for Cardiovascular Magnetic Resonance (SCMR), European Society for Cardiovascular Radiology (ESCR), Society for Cardiovascular Computed Tomography (SCCT), European Congress of Radiology (ECR), Radiological Society of North America (RSNA), and at annual meetings of the Dutch Radiological Society. He has chaired the Scientific Program Committee of the ESMRMB in 2017. Dr. Leiner has served on the Editorial Boards of European Radiology, the Dutch Medical Journal and the Journal of Cardiovascular Magnetic Resonance (JCMR). He currently is Associate Editor of the Journal of Magnetic Resonance Imaging (JMRI) and Radiology Cardiothoracic. Dr. Leiner has served on the Board of Trustees of the ISMRM from 2006-2009 and the Board of Trustees of the Society for Cardiovascular Magnetic Resonance (SCMR) from 2016-2019. He is the author of over 350 original papers, review articles and book chapters as well as editor of several electronic radiology textbooks. He is the immediate past president of the ISMRM and will take over as the new Editor-in-Chief of the Journal of Cardiovascular Magnetic Resonance (JCMR) per January of 2023.