6. Oracle: Larry Ellison
Larry Ellison left the University of Illinois at Urbana-Champaign after his sophomore year, then attended one semester at the University of Chicago before dropping out and moving to Northern California.
Later, while working for Ampex Corporation, he created a database for the CIA, which he named "Oracle." In 1977 he founded Software Development Laboratories, which was renamed Relational Software and ultimately became Oracle. Today, Ellison is worth $36 billion, according to Forbes.