Sourander is principal investigator and co-investigator in several studies and research consortiums. Sourander’s research activity focuses on time trends of psychiatric problems and service use, large birth cohort studies, population-based studies, international multi-site research and intervention studies. He has special expertise in prenatal epidemiology, developmental approaches and investigating the long-term outcome of psychiatric disorders as well as developing clinical methods, family oriented early interventions, RCT and implementation studies of web-based interventions.