Brian Francis is Professor of Social Statistics at Lancaster University and Associate Director of the Violence and Society UNESCO Centre . He has worked extensively in developing quantitative research methods in criminology, particularly in the areas of criminal careers and crime seriousness. He currently researches into homicide, domestic violence, sex offending and life course criminology. His interest in organised crime has covered the understanding the criminal histories of offenders, and policy work on human trafficking. He is particularly interested in statistical methods for estimating the size of the hidden victim population in human trafficking and in improving the evidence base through data consistency, especially across Europe.