3. Michael Dell

Responsible for creating one of the most dominant forces in the computer industry, Michael Dell enrolled on a pre-medical course at the University of Texas, but failed to finish.
While still at university, Dell began selling upgrade kits, and soon realised the huge potential of a direct-to-customer PC company. After winning contracts to supply PCs in Texas, it wasn’t long before Dell dropped out and focused all his efforts on his growing business.
The result? By 1992, aged 27, Dell became the youngest CEO ever in Fortune’s list of the top 500 corporations.
Now worth: US$18.9 billion
2. Mark Zuckerberg
The creator of Facebook studied psychology and computer science at Harvard, but dropped out in his second year to build his then embryonic Facebook project.
Originally called “thefacebook”, the fledgling social network was only open to students from selected colleges, but soon became the global phenomenon that is today.
In 2015, Facebook is no longer just a social network; it now owns key tech companies such as Oculus, Instagram and WhatsApp. What’s more, the company’s growth shows no signs of stopping.
Now worth: US$34.8 billion
Next: the most famous dropout