Dr. Tomas Koller is head physician of the Subdiv. of Gastroenterology and hepatology, Department of Internal medicine 5, Comenius University Faculty of Medicine, University Hospital Bratislava Ruzino. His research interests are drug induced liver disease, advanced chronic liver disease, nonalcoholic fatty liver disease, endoscopic ultrasound. He is vice president and member of the governing board of the slovak society of hepatology since 2018.