Celso Cunha is Associate Professor with Habilitation in Microbiology in the Institute of Hygiene and Tropical Medicine, Nova University, Lisbon. He has a MSc in Biochemistry (Moscow State University) and a PhD in Genetics (Lisbon University). He is coauthor of about 40 publications in the areas of virology and molecular and cellular biology. Current main research interests are related to the biology and pathology of Hepatitis delta virus.