Snap: Evan Spiegel

Blake Mycoskie started and sold four businesses before age 30. But only in Argentina did he discover the idea he'd want to pursue long term. After seeing a shoe drive for children, he came up with TOMS — part shoe business, part philanthropy. PLUS in our postscript "How You Built That," how a long-haired Southern Californian, Chris Healy, co-founded The Longhairs and created special hair ties for guys. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

29 Touko 201753min

In 1981, engineer Rod Canion left Texas Instruments and co-founded Compaq, which created the first IBM-compatible personal computer. This opened the door to an entire industry of PCs that could run the same software. PLUS in our postscript "How You Built That," how frustrated renter Melanie Colón created an easier way to communicate with noisy neighbors, called Apt App. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

22 Touko 201738min

In 1978, college drop-out John Mackey scraped together $45,000 to open his first health food store, "Safer Way." A few years later he co-founded Whole Foods Market — and launched an organic food revolution that helped change the way Americans shop. PLUS in our postscript "How You Built That," how Kyle Ewing created waterproof paper through his company TerraSlate. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

15 Touko 201745min

In 1972, Maureen and Tony Wheeler bought a beat-up car and drove from London "as far east as we could go." They wound up in Australia, by way of Afghanistan, India and Thailand. Their notes on how to travel on a shoestring became a book, which grew into Lonely Planet — the largest travel guide publisher in the world. PLUS in our postscript "How You Built That," how 15-year-old Michael Mendicino, with help from his mom, took a teenage trend and turned it into a board game called Bottle Flip. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

8 Touko 201740min

As a kid, Troy Carter dreamed of being a rapper, but soon discovered he was a better manager than a musician. He took Lady Gaga from obscurity to stardom – helping shape both her music and her brand. Then he turned his gift for spotting talent to spotting investment opportunities with his company Atom Factory. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

1 Touko 201744min

Barbara Corcoran grew up in a working-class Irish Catholic family in Jersey – with nine brothers and sisters. But she used her charisma to conquer the streets of Manhattan and build the real estate company, The Corcoran Group. She then reinvented herself as a shark – on Shark Tank.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

24 Huhti 201750min

Brian Scudamore didn't dream of a life hauling away other people's trash. But when he needed to pay for college, he bought a $700 pickup truck, painted his phone number on the side, and started hauling. Now 1-800-GOT-JUNK? makes over $200 million in annual revenue. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

17 Huhti 201740min

App developer Apoorva Mehta almost gave up on being an entrepreneur until he figured out what he really wanted to do: find a hassle-free way to buy groceries. Five years after launch, the grocery delivery app Instacart is valued at $3 billion. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

10 Huhti 201739min