Jan Marsal is an Associate Professor and Senior Consultant Gastroenterologist, working at Skane University Hospital and Lund University in Lund/Malmö, Sweden. His focus is Inflammatory Bowel Disease (IBD) and he runs a research-group with six PhD-students, exploring various aspects of IBD, from basic immunology, through translational questions, to clinical issues. He has defended a basic-science PhD-thesis in immunology after 6 years of laboratory work, including 14 months as a Visiting Research Fellow at Harvard Medical School, Boston. Dr Marsal's group recently described a novel T-cell subpopulation with functional implications for IBD. The group is also developing new immunological tools for better understanding the pathogenesis in IBD, for better delineation of subgroups of IBD-patients, for measuring the degree of intestinal inflammation in a stringent and objective manner, and for predicting response to targeted therapies. Other projects address monitoring of IBD-patients, together with optimization of management and treatment. The group also has an interest in cancer-immunology and inflammatory phenomena secondary to immune check-point inhibitor therapies, together with treatment strategies for the same. Dr Marsal is chairing the Therapy Group of SOIBD (Swedish Organisation for the study of IBD), and is involved in various expert groups writing National Guidelines for IBD.