I am a social statistician with interests in preference models, latent class methods for longitudinal data, mixture models and categorical data problems. Applications are crucial to my work. I primarily research into quantitative criminology -both methodological and substantive problems -  focusing on the criminal careers of offenders and social and developmental change. I am also interested in analysing administrative and survey data and am investigating issues related to violence and serious offending, including sexual offending, homicide, trafficking, organised and cyber-crime. Recent work has focused on high frequency victimisation and gender based violence.  More broadly I  am working on child developmental studies in psychology.