Little is known about how teachers and doctors make sense of ADHD. Drawing on a corpus of online accounts, we reconstructed their worldviews with a qualitative analysis. While both professional groups referred to a male troublemaker and to the German literary figure of the Fidgety Phil, they also expressed rival expert claims. Doctors represented the scientific authority in labeling and diagnosing ADHD, whereas teachers attached objective meaning to the medical judgement by pathologizing deviant behavior and justifying measures of control.