Now he has a company worth billions after Thursday's IPO.
Wellness guru Deepak Chopra explains how small talk could help you live a happier, more successful life.
"Trillion dollar coach" Bill Campbell was a football coach-turned-management guru who mentored some of the most successful executives in tech, including Google billionaire Eric Schmidt and Apple's Steve Jobs.
Twenty-six-year-old rapper Cardi B reveals the mistakes she made in business and what to do instead.
Looking back as a billionaire in his 60s, Microsoft co-founder Bill Gates has some advice for his younger, introverted self.
Kevin O'Leary explains the risks of taking out a mortgage and what you need to do first before you think about one.
It can even give a certain kind of person permission to treat you poorly, or even abuse you.
"My publishers were certain it would be my first best-seller, and nobody bought it."
"Wandering is an essential counter-balance to efficiency."
"It didn't make any sense, and yet, my gut said go for it."
This chemist and PhD built and donated high-capacity water filters to Flint, Michigan during the drinking water crisis. The experience gave him an idea for a better water filter that he pitched on Shark Tank.
To do the extraordinary, you have to ignore some basic business advice.
Alibaba's founder and billionaire Jack Ma has stirred up controversy after saying that young people should see major tech companies' overtime work cultures as a "huge blessing."
Tesla CEO Elon Musk said the cars are already built with the hardware they'll need.
"It's not really about the parents; it's the damage they've done to their kids," he says.
David Heath and Randy Goldberg founded Bombas in 2013 as a way to help people experiencing homelessness. For every pair of socks they sell, they donate a pair to those in need. They've donated over 18 million socks so far.
One of them is a "visionary" 800-page sci-fi novel.
It's something nearly anyone can learn.