How did the greatest entrepreneurs start out? What were their biggest successes? What failures did they have to overcome along the way? We’ve charted the careers of 33 inspirational company founders, from the man behind Heinz beans to the woman behind Ultimo bras, to show that there’s more than one path to success.

Unicorns are rare beasts of the business world, startup companies that are valued at $1B or more. Once considered the stuff of myth, there are now over 180. See how quickly the world's most successful startups got their billion-dollar valuations.

See how long it took 21 of the world’s richest entrepreneurs to build their fortunes. Find out who was the youngest billionaire, who went from $1 million to $1 billion the fastest, and who took their time to prosper.