The 79-year-old designer founded his eponymous fashion company by selling ties out of his desk drawer while working in an office in the Empire State Building, according to the company's website.
Called "the man who made American fashion cool" by Forbes, Lauren currently has a net worth of $5.8 billion — and he only finished two years of college.
Koum worked at Yahoo for nine years before founding WhatsApp, Business Insider previously reported in May 2017.
The 43-year-old computer programmer has a net worth of $10 billion, Forbes estimates.
Zuckerberg founded the social network to help fellow students learn the names of the people in their classes, Business Insider previously reported. He dropped out shortly after.
The 35-year-old entrepreneur has a current net worth of $66 billion, Forbes estimates.
Adelson first became wealthy after founding a company called COMDEX that hosted technology-focused trade shows, Business Insider previously reported in May 2019. In 1995, Adelson and his partners sold it along with other smaller shows to SoftBank for $862 million.
The 86-year-old has a net worth of $33.1 billion, Forbes estimates.
Turner was expelled from Brown for allowing his girlfriend to live with him in his dorm room, Business Insider previously reported. Despite the rather murky end to Turner's time as a student there, the university issued him honorary degrees years later.
The 80-year-old has a net worth of $2.2 billion, Forbes estimates.
Warner went on to sell encyclopedias, work as a valet, and sell stuffed animals for now-defunct toy company Dakin before founding Ty Inc. and creating the iconic Beanie Baby, according to HuffPost. Forbes reports that Warner also owns several hotels, including the Four Seasons in New York.
But Warner's career wasn't without controversy. He pled guilty to charges of tax evasion in 2017 for hiding income in a Swiss bank, according to HuffPost.
The 74-year-old now has a net worth of $2.6 billion, Forbes estimates.
Source: Chicago Tribune
Geffen later admitted publicly that he had actually dropped out of the University of Texas at Austin, according to Forbes. He worked as a talent agent at William Morris prior to founding DreamWorks.
The 76-year-old is now the richest man in Hollywood, and Forbes estimates that his net worth is about $8.4 billion.
Source: Business Insider
As a student, Dell spent his spare time upgrading PCs and selling them from his dorm room, Business Insider previously reported in November 2018. He made $180,000 in his first month of business the summer after his freshman year and never went back to school.
The 54-year-old has a current net worth of $30.6 billion, Forbes estimates.
Ellison enrolled in the University of Illinois at Urbana-Champaign after high school but dropped out during his sophomore year after his adoptive mother died, Business Insider previously reported. He later completed one semester at the University of Chicago.
Read more: The life and rise of billionaire Oracle founder and international playboy Larry Ellison, who dropped out of college twice and has a $68 billion fortune
The 75-year-old has a net worth of $63 billion, according to Forbes.
In 2010, The Harvard Crimson called Gates "Harvard's most successful dropout." He left the Ivy League school during his sophomore year in 1975.
The 63-year-old is worth $102 billion, according to Forbes.
Read more: Bill Gates is no longer the 2nd-richest person in the world. Here's how he spends his $107 billion fortune, from a luxury car collection to incredible real estate
After Scour filed for bankruptcy, Kalanick also founded a networking-software company called Red Swoosh. Kalanick sold Red Swoosh to Akamai for $23 million in 2007, Business Insider previously reported. He used some of that money to spend a year traveling the world before founding Uber.
The 43-year-old has a net worth of $3.7 billion, Forbes estimates.
Read more: The life and rise of Travis Kalanick, Uber's controversial billionaire co-founder and former CEO