Pieter J. Hoekstra is a Professor of Child and Adolescent Psychiatry at the University of Groningen. He graduated as an MD in 1994 and as a PhD in 2003. His research interests include ADHD (treatment, neuroimaging and genetics), Autism Spectrum disorders (treatment and genetics), Intellectual disability (etiology and treatment), psychopharmacology, and Tic disorders (immunology, treatment, and genetics). He is a member of Eunethydis and editor-in-chief of European Child and Adolescent Psychiatry.