Ridesharing wasn't a thing 12 years ago when John Zimmer was in college. But a class on green cities got him thinking about the glut of underused cars on the road, and eventually led him to co-found Lyft, a company that has helped make ridesharing a way of life.
Computer scientist Tony Hsieh made millions off the dot-com boom. But he didn't make his mark until he built Zappos — a customer service company that "happens to sell shoes." Now Zappos is worth over a billion dollars and known for its completely unorthodox management style.
A 1991 conversation at a Mexican restaurant led Kate & Andy Spade to ask, "What's missing in designer handbags?" Kate's answer was a simple modern-shaped handbag that launched the iconic fashion brand: Kate Spade.