Dr O’Connor completed his BSc (Hons) in Physiology before commencing a postgraduate degree in Dietetics, graduating 2002. He went on to specialise in Paediatric Dietetics and joined Great Ormond Street Hospital for Children in 2008, specialising in eating disorders and Intensive Care. In 2010 he started a PhD at the Institute of Child Health, investigating energy intake and the refeeding syndrome – the results of this study changed national and European guidelines. Dr O’Connor’s Post-Doctoral research includes monitoring gut inflammation in infants with cardiac defects and intestinal microbiomes and short chain fatty acids in intensive care. Dr O’Connor also holds an honorary position at the Institute of Child Health University College London in the department of Infection, Immunity and Inflammation.

Ola Olén is a pediatric gastroenterologist at Sachs’ children's hospital in Stockholm and an associate professor at the Clinical Epidemiology Division at Karolinska Institutet, Stockholm. His clinical time is mainly devoted to patients with IBD or patients with disorders of gut-brain interaction. Dr Olén is PI for a large register-based linkage including all IBD patients in Sweden and matched controls. He leads a team conducting IBD research in national and international collaboration. The research is based on clinical data in national health registers, trials and local biobanks. Dr Olén is also a member of ECCO, the PIBD Porto-group of ESPGHAN, and SOIBD.

Salvatore Oliva, MD, PhD, is an associate professor of pediatrics in the Maternal and Child Health Department of Sapienza University of Rome in Rome, Italy, and a consultant pediatric gastroenterologist at Umberto I University Hospital in Rome. He holds a PhD in biotechnology in clinical medicine from the Sapienza University of Rome School of Medicine. Prof Oliva has authored over 20 book chapters and more than 120 manuscripts, published in leading international peer-reviewed journals focusing primarily on pediatric gastroenterology, inflammatory bowel disease (IBD), gastrointestinal endoscopy, and eosinophil-associated gastrointestinal disorders (EGIDs). A member of the European Society of Pediatric Gastroenterology, Hepatology, and Nutrition (ESPGHAN), he is involved in the work of its Endoscopy Working Group, Eosinophilic Gastrointestinal Disorders Working Group, and IBD Interest Group, as well as in coordinating the European Pediatric Registry of Eosinophilic Esophagitis (pEEr) and the Pediatric Eosinophilic Gastrointestinal Disorders Biobank (PEGID-BB) on behalf of ESPGHAN. He also serves as a pediatric officer on the Steering Committee of the European Society for Eosinophilic Oesophagitis (EUREOS). Prof Oliva is a recipient of the Consortium of Eosinophilic Gastrointestinal Disease Researchers (CEGIR) Training Award.

- Registered Nurse since 1982; registration number (BIG) 09013510430 - Head of Psycho-geriatric Departement, Stichting Verpleeghuizen Nederland 1982-1986 - Business Administration University Utrecht 1986-1988 - Chief Nurse Surgical Ward Academic Hospital Utrecht (UMCU) 1988-1996 - Chief Nurse Surgical Medium Care UMCU 1997-2000 - Chief Nurse Technician GI-lab, UMCU 2000-2010 - Chief Nurse Technician Motility Center, Academic Medical Center Amsterdam 2010-current

Head of Pediatric Gastroenterology Faculty, Centre of Postgraduate Medical Education, Warsaw, Poland. Head of the Gastroenterology Outpatient Clinic, The Children’s Memorial Health Institute, Warsaw, Poland. Professor at Department of Gastroenterology, Hepatology, Feedings Disorders and Pediatrics, The Children’s Memorial Health Institute in Warsaw, Poland. Gastroenterologist, pediatric gastroenterologist and pediatrician. Member of the European Pancreatic Club (2019-2022 Ordinary Councillor Clinical Science). From 2016 to 2023 President of Pancreatic Committee of The Polish Society of Paediatric Gastroenterology, Hepatology and Nutrition (from 2023 Ordinary Councillor). Member of International Association of Pancreatology and American Pancreatic Association. Main domain of research: Hereditary and chronic pancreatitis, IBD and motility disorders: constipation, GERD, achalasia. Major interest: genetic background of pancreatitis and endoscopic treatment of chronic pancreatitis. Co-author of international and national pancreatic guidelines. The Children’s Memorial Health Institute in Warsaw started genetic testing in chronic and hereditary pancreatitis in 2000 as a first center in Poland and one of the first pediatric centers in the World. Institute as a leading national pediatric pancreatic centre, admits most of the pediatric chronic pancreatitis cases from whole Poland. Our group of children with chronic pancreatitis (over 500 patients) is the largest single-center group in the World.

Esther Orlanski-Meyer is a pediatric gastroenterologist at the Juliet Keidan Institute of Pediatric Gastroenterology and Nutrition at Shaare Zedek Medical Center in Jerusalem. Her main clinical focus is pediatric intestinal failure and nutrition and she heads the institute's feeding clinic. Additionally, her research foci include nutrition and IBD.