I have 20 years of experience and specialize in the field of child and adolescent psychiatry and psychology, with specific knowledge of attention deficit hyperactivity disorder (ADHD), oppositional defiant disorder (ODD) and conduct disorder (CD). I have published on such topics as family factors in ADHD, medication treatment of ADHD, and biological factors in CD and antisocial personality. I have testified on ADHD issues related to child custody.