Ludwig Kraus is scientific director of the IFT Institut für Therapieforschung in Munich, privatdozent in the Department of Psychology at the Westfälische Wilhelms-University in Münster, and guestprofessor in the Centre for Social Research on Alcohol and Drugs (SoRAD) at Stockholm University, Sweden.
 
He is assistant editor of the journal Addiction. His main research interests span social and clinical epidemiology of substance use and gambling behaviour, diagnostics of substance-related disorders and pathological gambling, and addiction prevention.
 
At the IFT he is directing the Epidemiological Survey of Substance Abuse (ESA), a repeated cross-sectional survey that is conducted since 1980 enabling the monitoring of time trends and the analysis of associations between consumption patterns and problematic behaviour. At SoRAD he is working within the "Women, Health and Substance Use" programme.