Brother murdered by Nazis in the family's native Ukraine. Raised in abject poverty and tormented by anti-Semitic bullies. Held out of school because he spoke no English. With such a horrific child-hood, it's no wonder little Yonkil Roseman was haunted by a recurring nightmare: his domineering mother commanding him to jump down a flight of stairs, then turning away as he lay in a heap at the bottom. In real life, Jack Roseman jumped as well - jumped out of poverty and self-doubt to become a pioneer in America's fledgling computer industry. At MIT, he worked on one of America's first computers, a building-sized monster that helped the country develop its air defense system. In the 1960s, when NBC needed computers to enter the new field of election forecasts, it called on Jack. During the War on Poverty in the 1970s, Jack and his computers were soldiers, coaxing reports from sometimes-reluctant grant recipients to help Washington track its dollars. Later, as a professor at Carnegie Mellon University in Pittsburgh, he was a beloved teacher and mentor for aspiring business owners, putting his stamp on the next generation of entrepreneurs. Above all, as he advanced the computer industry, founded businesses and coached entrepreneurs, he did so with grace, humility and a self-effacing wit that enabled him to become the mensch he promised his father he would be. Jack Roseman's life and career offer breathtaking sweep and a compelling narrative.Jump is inspirational - especially for those on the brink, pondering that leap into an uncertain future.