This book provides an interesting analysis of world leaders & how their mental health influenced their leadership. The author's analysis of such world figures as Lincoln, General Sherman, Hitler, FDR, Nixon, JFK and many others and how they reacted during crisis and non crisis situations depending on his interpretation of their mental health is fascinating. His conclusion is that leaders with certain types of mental illness (bipolar) handle crisis situations better than non mentally ill (normal) personalities. My sister, a psychologist, disagrees with much of his research & findings, but I found his background info on each of the figures enlightening.