Karel Geboes, MD, PhD, AGAF, gained the Board Certificate in internal medicine in 1975 and in anatomic pathology in 1982. He is Professor Emeritus of the University of Leuven and former head of the Gastrointestinal Pathology unit of the department of pathology, University Hospital KULeuven, Belgium. He was consultant pathologist in the Department of Pathology of the University Hospital of Gent (2010-2017). He was a member of the International Organization of Inflammatory Bowel Diseases, of the working group of Digestive Pathology of the ESP and of the Consensus Working Party for the Diagnosis of Inflammatory Bowel Disease of ESP and ECCO and has been President of the Flemish Society of Gastroenterology (1997-1999). He was for many years course director or lecturer for the European School of Pathology (ESCOP) update courses in gastrointestinal pathology. His major research interests are inflammatory bowel diseases and gastrointestinal cancer. He is the author or co-author of more than 500 articles in international journals and book chapters and was a collaborator for the textbook of the WHO Classification of Tumours of the Digestive System, 4th ed 2010.