Vytautas Usonis is a professor of Paediatrics at Vilnius University and currently Head of the Vilnius University Clinic of Paediatrics. He holds an undergraduate degree in medicine/paediatrics (1974). His PhD was on the immunology of viral hepatitis (1981) and his doctor habilitatus dissertation was on the immunopathogenesis and vaccine prophylactics of viral hepatitis B (1990). Vytautas Usonis is an expert on vaccine-related issues. He is on the editorial boards of a number of national and international scientific journals as well as being a member of the international vaccination advisory and working groups.He is (co-)author of more than 150 publications on paediatric infectious diseases published in English, Russian and Lithuanian (research articles, textbooks and chapters in textbooks on paediatric infectious diseases, vaccine preventable diseases and vaccinology, rotavirus infection, paediatric HIV infection). He has been teaching various courses on paediatric infectious diseases and vaccinology for undergraduate medical students and postgraduate physicians at Vilnius University. He supervised 10 doctorates at Vilnius University and was an external jury member of numerous doctorates and habilitations in Lithuania and abroad. He was also a tutor of Oxford University’s Postgraduate Diploma in Paediatric Infectious Diseases (2008-2015).He is a member of the European Academy of Paediatrics (CESP) and Chair of the Board of Baltic Immunoprophylaxis Association. He has been a board member of the European Society of Paediatric Infectious Diseases (ESPID), Chair of the National Committee for Poliomyelitis Eradication Certification in Lithuania, a board member of the National Board on Immunisation of Lithuania. He was President of the Lithuanian Paediatric Society (LPS) 2000 to 2007 retiring after two terms according to the Constitution of the Society. He has since been the Vice-President and board member. From 1997 to 2003 he was President of the UNICEF National Committee of Lithuania.