Russell Alan Barkley (born December 27, 1949) is a clinical psychologist who is a clinical professor of psychiatry at the VCU Medical Center and an author of books on attention-deficit hyperactivity disorder (ADHD). Involved in research since 1973 and a licensed psychologist since 1977, he is an expert on ADHD and has devoted much of his scientific career to studying ADHD and related fields like childhood defiance. He proposed to change the name of sluggish cognitive tempo (SCT) to concentration deficit disorder (CDD). Author of 27 books and more than 280 scientific papers and book chapters, his research articles include multiple papers from his longitudinal study in Milwaukee, Wisconsin, his development of a theory of ADHD as a disorder of executive functioning and self-regulation, his early research on family interaction patterns in ADHD children, his more recent studies on the nature of ADHD in adults, early intervention for children at risk for ADHD, training parents to manage ADHD and defiant behavior, and the nature of sluggish cognitive tempo. He is an "Impassioned editor" of the SCT wikipedia page. His research has been cited by more than 91,000 other authors and he has a H-index (citation impact factor) of 133 on Google Scholar. Barkley also edits The ADHD Report, a newsletter for clinicians and parents. Besides his clinical work, he is also an expert in the neuropsychology of executive function and self-regulation. He has given more than 800 invited lectures in more than 30 countries during his career, and is board certified in three clinical specialties: clinical neuropsychology, clinical psychology, and clinical child and adolescent psychology. Early life and education Russell Alan Barkley was born in Newburgh, New York. He was one of five children, born to US Air Force Colonel Donald Stuart Barkley (27 February 1916 – 15 June 1999) and Mildred Minerva née Terbush (10 September 1914 – 25 April 2008). Barkley had a fraternal twin brother, Ronald Foster Barkley, who was killed in a car crash on 24 July 2006. Barkley attributes his brother's history of dangerous and reckless behavior, including not wearing a seat belt and speeding at the time of his crash, to untreated ADHD. Ronald was several times over the legal alcohol limit, speeding and not wearing a seat belt at the time of his fatal crash. Barkley earned an Associate of Arts from Wayne Community College in Goldsboro, North Carolina in June 1972, and