He is professor of medicine and director of IBD Centre at McGill University Health Centre. Until January 2017 he was head of the gastroenterology/hepatology ward, endoscopy unit and outpatient clinic at the 1st Department of Medicine, Semmelweis University in Budapest, Hungary He is member at large and member of scientific committee of CIRC, and an IOIBD member. He is one of the founders and leader of the Hungarian IBD Study Group. He is associate editor in J Crohn’s Colitis, Digestive Liver Diseases and World Journal of Gastroenterology and section editor in Inflammatory Bowel Diseases. During his career he published more than 400 original papers and reviews and 26 book chapters with a Google Scholar's H index of 87 and over 31000 citations - - - -