Career
His research focuses on rational-choice theories in social sciences. Methodology and application of models of classification and structural equation in crossand longitudinal studies. Statistical techniques for the handling of missing data.
Health, Acquired Immune Deficiency Syndrome-prevention and contraception of youth and young adults.
Development of juvenile delinquency in longitudinal studies. Regional differentiation in the development of disorientation and group-focused enmity.
He is associate editor of the series “Kriminologie und Kriminalsoziologie“(since 2006) and also associate editor of the series “Sozialwissenschaftliche Forschungsmethoden“(since 2009). Strong and efficient multiple imputation of complex records (German Research Foundation (Deutsche Forschungsgemeinschaft), 2009-ongoing) Crime in modern cities (German Research Foundation (Deutsche Forschungsgemeinschaft), 2002-ongoing) J.