A 37-year-old Wall Street trader schedules a visit after his 8-year-old son is diagnosed with attention-deficit/hyperactivity disorder (ADHD), combined inattentive and hyperactive. Although he does not currently note motor restlessness like his son, he recalls being that way when he was a boy, along with being quite inattentive, being impulsive, talking excessively, interrupting, and having problems waiting his turn. He was an underachiever in high school and college, when he inconsistently did his work and had difficulty following rules. Nevertheless, he never failed any classes, and he was never evaluated by a psychologist or psychiatrist. He works about 60–80 hours a week and often gets insufficient sleep. He tends to make impulsive business decisions, can be impatient and short-tempered, and notes that his mind tends to wander both in one-on-one interactions with associates and his wife and during business meetings, for which he is often late; he is forgetful and disorganized. Nevertheless, he tends to perform fairly well and is quite successful, although he can occasionally feel overwhelmed and demoralized. What is the most likely diagnosis?
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