Tomasz Stadejek is a DVM who from 1991 to 2011 worked at the Department of Swine Diseases of the National Veterinary Research Institute in Pulawy, Poland. During this period he worked as a guest researcher at the National Animal Disease Centre (NADC) and National Veterinary Services Laboratories in Ames, Iowa, USA, National Veterinary Institute in Uppsala, Sweden, Veterinary Laboratories Agency - Weybridge, Addlestone, UK and the National Veterinary Institute, Lindholm, Denmark. His main research topics were molecular diagnosis and epidemiology of pestiviruses, arteriviruses and circoviruses. In 2007 Prof. Stadejek was appointed by the World Organization for Animal Health (OIE) as an expert for PRRS, and in 2007-2011 he was the head of the OIE. Reference Laboratory for PRRS. He is a member of Arterivirus Study Group of the International Committee for Taxonomy of Viruses. In 2008 he obtained diploma of the European College of Porcine Health Management (ECPHM) and from 2011 to 2013 he was a board member and the secretary of the college. Since 2012 he is full professor at the Institute of Veterinary Medicine at the Warsaw University of Life Sciences. His current research is focused on diagnostic and epidemiology of emerging viral pathogens of swine and their impact on production performance, such as PRRSV, IAV, PCV2, PCV3 and novel porcine parvoviruses. He is a co-author of more than 100 peer reviewed papers listed in Scopus. He is a frequently invited speaker at international veterinary and virological congresses.