Drs. Solanto, Arnsten, and Castellanos and their 16 associates have provided us with a comprehensive volume that looks back to George Still’s 1901 description of a group of 20 overactive and inattentive children and forward to the need for ongoing research. The organization of the book in four parts—Phenomenology, Basic Neuroscience, Clinical Neuroscience, and Integration—increases the book’s usefulness.