F. Xavier Castellanos (born November 16, 1953) is a Bolivian neuroscientist who is the director of research at the NYU Child Study Center. His work aims at elucidating the neuroscience of ADHD through structural and functional brain imaging studies, collaborating on molecular genetic studies, and coordinating an interdisciplinary network of translational investigators (the ADHD Neuroscience Network). Dr. Castellanos chaired the NIH ‘Initial Review Group’ (Study Section) on Developmental Psychopathology and Developmental Disabilities from 2005–2007 and was chairing the revision of the diagnostic criteria for externalizing disorders for the at the time forthcoming edition of DSM-5, which was released in 2013. He continues to make significant contributions to research into the neurobiological substrates of attention deficit hyperactivity disorder. Source: Wikipedia (en)