Margaret Sibley, PhD is professor of psychiatry and behavioural sciences at the University of Washington School of Medicine and a clinical psychologist at Seattle Children’s Hospital. She has written more than 130 scholarly publications on ADHD, is a professional advisory board member for Children and Adults with Attention Deficit Hyperactivity Disorder (CHADD), and is chair of the screening and diagnosis subcommittee of the US adult ADHD guidelines soon to be released by the American Professional Society of ADHD and Related Disorders (APSARD).