The long-term goal of my research program is to understand the mechanisms in the development of externalizing behavior problems (e.g., ADHD, conduct problems, aggression). My work examines the roles of bio-psycho-social risk factors in the development of psychopathology, including brain functioning, genetics, parenting, temperament, language, and sleep. A special emphasis of my work is on understanding these mechanisms in early development, which may lead to improved intervention and prevention approaches.