In "The Hypomanic Edge," John D. Gartner embarks on a fascinating exploration of the razor-thin line between genius and madness, arguing that the engine of American innovation and spirit is fueled by a psychological condition: hypomania. With compelling narrative flair, Gartner posits that this mild form of mania imbues its bearers with extraordinary energy, boundless creativity, and an unyielding propensity for risk-taking—traits that have shaped the contours of American history and achievement. Through the lens of clinical psychology and riveting biographical sketches, Gartner reveals how this temperamental gift has contributed to the monumental successes of iconic figures who have undeniably left their mark on the world. This groundbreaking work not only challenges our traditional perceptions of mental health but also celebrates the fine line between disorder and genius. Gartner meticulously identifies historical luminaries whose hypomanic traits may have propelled them into the annals of history, offering an intriguing perspective on how this genetic inheritance has been a double-edged sword: a font of innovation and ambition, yet also a harbinger of personal turmoil. "The Hypomanic Edge" is a compelling narrative that illuminates the complex interplay between the minds that have shaped America and the psychological traits that have defined them, inviting readers to reconsider the essence of greatness through the prism of psychological science.