Nikolaos K. Gatselis serves as Associate Professor of Medicine at the University of Thessaly and practices Medicine at the Department of Medicine and Research Laboratory of Internal Medicine, National Expertise Center of Greece in Autoimmune Liver Diseases, Full Member of the European Reference Network on Hepatological Diseases (ERN RARE-LIVER) at the General University Hospital of Larissa, Larissa, Greece. He was MD in 2001 and PhD in 2006 from Larissa Medical School, University of Thessaly and trained Internal Medicine between 2004-2008 at the Department of Medicine and Research Laboratory of Internal Medicine, University of Thessaly. Between 2010-2011, he worked as a Post-Doctoral Research Fellow in “French National Reference Center for Viral Hepatitis B, C and delta” & “Research Team – Pathophysiology and Therapy of Chronic Viral Hepatitis”, Hospital Henri Mondor, University Paris Est, INSERM U955. His research interest focuses on hepatology and in particular on autoimmune liver diseases, and chronic viral hepatitis. He participates in several international and national clinical studies. He acted as an invited speaker in 125 international and national congresses. He also participated with oral or poster presentations in 256 international and national congresses. He has been awarded with 24 distinctions so far, including scholarships, fellowships, medical competitions, awards for best oral and poster presentations in congresses. Since February 2020, he has been involved in the management of COVID-19 patients in the Infectious Diseases Unit of the Department of Medicine at the General University Hospital of Larissa, Larissa, Greece. Nikolaos K. Gatselis has co-authored in 127 articles in peer reviewed journals with more than 4900 citations (h-index = 38 google scholar; 33 in Scopus). He is reviewer in 57, member of the editorial board in 13 international journals and academic editor in 2 international journals .