Francisco Guarner graduated in Medicine at the University of Barcelona in 1973, trained Gastroenterology and Hepatology at Hospital Clinic (Barcelona); obtained PhD degree at University of Navarra (Spain). He was Research Fellow at Royal Free Hospital (London, UK), King’s College Hospital (London, UK), and Research Laboratories (Beckenham, UK). He is Consultant of Gastroenterology at the Digestive System Research Unit, University Hospital Vall (Barcelona, Spain). Chair of the Steering Committee of the International Human Microbiome Consortium (www.human-microbiome.org), member of the Scientific Committee of Gut Microbiota for Health Section of the European Society of and Motility (www.gutmicrobiotaforhealth.com), and past member of the Board of Directors on the International Scientific Association for Probiotics and Prebiotics (isappscience.org). Co-author of 319 publications on original research or reviews (Web of Science), holds an h-index of 62.