Historians have long puzzled over the apparent mental instability of great and terrible leaders alike: Napoleon, Lincoln, Churchill, Hitler, and others. In A First-Rate Madness, Nassir Ghaemi, director of the Mood Disorders Program at Tufts Medical Center, offers a myth-shattering exploration of the powerful connections between mental illness and leadership and sets forth a controversial, compelling thesis: the very qualities that mark those with mood disorders also make for the best leaders in...