The key areas of expertise are neuroimaging of cognitive functions in normal development; structural and functional neuroimaging of neurodevelopmental disorders, most prominently ADHD but also autism spectrum disorder (ASD), obsessive-compulsive disorder (OCD), conduct disorder and childhood maltreatment; pharmacological imaging of ADHD drugs and of neurotransmitter manipulations (Methylphenidate, Lisdexamfetamines, Atomoxetine, Guanfacine; Fluoxetine, Tryptophan depletion, Tianeptine, Cannabis, Heroin); PET imaging in ADHD adults; Neurotherapeutics such as Real-time fMRI Neurofeedback and non-invasive brain stimulation combined with cognitive training in ADHD.