In the mid-1970s, computer engineer and entrepreneur Stephen Wozniak cofounded Apple Computer with CEO Steven Jobs, thus ushering in a technological revolution that changed the very face of society. Born on Aug. 11, 1950 in San Jose, CA, Wozniak grew up loving electronics and made all manner of devices, including calculators and a ham radio. By the time he was in sixth grade, he built a machine that played Tic-Tac-Toe for a science fair project. After flunking out of the University of Colorado, Wozniak attended the University of California in 1971, but dropped out to take a job designing calculators for Hewlett-Packard. It was there that he met Jobs, another computer enthusiast bored with school, who convinced a skeptical Wozniak to design a personal computer. Working out of Jobs' bedroom - and later his garage - the two made the Apple I, a purely hobbyist machine that lacked a monitor, keyboard and power supply, all of which had to be provided by the user. In 1976, Jobs and Wozniak formed Apple Computer, prompting him to quit his job from Hewlett-Packard. That same year, Wozniak and Jobs introduced the much-improved Apple II, one of the first highly-successful personal computers put on the market. By the time Apple Computer went public in 1980, Wozniak and Jobs were millionaires.