Klaus Osterrieder is currently Professor of Virology and Chair at Freie Universität Berlin, Germany and Adjunct Professor of Virology at Cornell University. His work over the past nearly 25 years has concentrated on the molecular mechanisms of herpesvirus pathogenesis, oncogenesis and vaccine development. The model viruses his laboratory is working on are varicella zoster virus (VZV), equine herpesvirus type 1 (EHV-1) and particularly Marek’s disease virus (MDV). Using infectious clones and reverse genetics, Klaus and his laboratory mechanistically study viral pathogenesis and utilize the knowledge gained for engineering of modified live virus vaccines. The research has been funded continuously since 1994 by public funding agencies including the European Commission, the NIH, the USDA, the DFG and other public and private sources. Klaus is a member of the editorial board of a number of journals, among them Zoonosis and Public Health, Journal of Virology, Virus Research, Virology Journal and Veterinary Microbiology. His honors include membership in the Academy of Sciences in Thuringia since 2014, the Young Investigator Award of the Academy for Animal Health (2002) and the WVPA-Boehringer Ingelheim Vaccine Innovation Award (2017).