"John Cartner, a psychiatry professor at Johns Hopkins University medical school, conducted research that supports [the idea that successful entrepreneurship is in the genes]. In his book The Hypomanic Edge: The Link Between (a Little) Craziness and (a Lot of) Success in America, suggests that successful entrepreneurs suffer from hypomania, which he describes as a psychological condition—marked by high energy and boundless self-confidence—falling just short of bipolar disease, also known as manic-depressive state. Unlike people suffering from bipolar disorders, those with hypomania rarely collapse into suicidal despair. Instead, after suffering a major negative event, they pick themselves up and resume their battle as confident as ever."
- Robert Herjavec, Driven: How to Succeed in Business and in Life, pp.49-50
