Michael Dell Michael Dell dropped out of University of Texas at Austin his freshman year at the age of 19.
Steve Jobs The founder of Apple left Reed College when he was just 19, reportedly because it was too much of a financial burden for his family.
Julian Assange Before he was a controversial computer hacker, Julian Assange studied mathematics at the University of Melbourne.
Bill Gates Bill Gates attended Harvard for two years before leaving to build what would become Microsoft.
Evan Williams Evan Williams grew up in Clarks, Nebraska, where his family ran a farm. He attended the University of Nebraska at Lincoln for three semesters before dropping out.
Mark Zuckerberg Mark Zuckerberg dropped out of Harvard, founded Facebook and became the 5th wealthiest man alive.
Larry Ellison Larry Ellison is known as a software billionaire and founder of Oracle. When he was growing up, however, his adoptive parents encouraged him to be a doctor.
Jan Koum Immigrant entrepreneur Jan Koum worked his way through college only to quit before graduating.
Travis Kalanick Before becoming the CEO and founder of Uber, Travis Kalanick studied computer engineering at UCLA.
John Mackey John Mackey studied religion and philosophy at the University of Texas before dropping out, borrowing $45,000, and starting a health food store called SaferWay in downtown Austin.