Stéphane Chevaliez is Assistant Professor at the University of Paris-Est. He is an Associate Director of the French National Reference Center for Viral Hepatitis B, C and a member of the department of Virology, and of INSERM Unit U955 at the Henri Mondor University Hospital in Creteil, France. He focuses on teaching, diagnosis and research in hepatitis viruses. He earned his PharmD and a doctorate in molecular virology from the University of Paris XI and the Pasteur Institute of Paris, France. Dr Chevaliez has published a number of original and review articles on the diagnosis and virological monitoring of chronic viral hepatitis, the mechanisms of action of ribavirin in chronic hepatitis C therapy and new drug developments. His research focuses on the molecular mechanisms underlying the success and failure (including viral resistance) of chronic hepatitis B and C therapies. He is a member of the concerted action 33 (AC33, HBV and HCV resistance to antiviral drugs) of the French National Agency for AIDS and Viral Hepatitis Research (ANRS).