Clinical psychologist Thomas Brown Ph.D. tells why middle-aged women suddenly develop ADHD, why brain imaging is worthless in diagnosing the condition, and why many doctors just don’t understand attention deficit. Thomas Brown, Ph.D., sees ADHD from all sides: as a researcher, as a teacher at a medical school, and as a psychologist helping patients manage their symptoms and reclaim their lives. A clinical professor of psychiatry at the Yale University School of Medicine.