Bill Gates

Dropped out of Harvard after two years to start Microsoft, becoming one of the world's richest.

Elon Musk

Left Stanford University in two days to start his first company, Zip2. Mark Zuckerberg: Dropped out of Harvard to focus on the development of Facebook.

Ralph Lauren

 Left the City University of New York's Baruch College after completing two years.

Steve Jobs

Left Reed College after a semester due to financial constraints.

Larry Ellison

Dropped out of two different universities before founding Oracle.

Michael Dell

Left the University of Texas in Austin at 19, later starting Dell Technologies.

Jack Dorsey

Dropped out of college twice, from the University of Missouri-Rolla and later from New York University.

Jan Koum

Dropped out of San Jose State University before co-founding WhatsApp.