Nick Woodman is described as a "mad billionaire," a thrill seeker who drinks Red Bull, eats McDonald's and howls his way down ski slopes.
But Woodman, who is the founder of action camera maker GoPro, also is an entrepreneur, now running one of the most popular consumer electronics companies on the planet.
Read MoreGoPro's hot, but for how long?
What was it like to grow up with Woodman?
I graduated from Menlo School in California with him in 1993. Recently, I asked old friends what they remember about Woodman, and what they think explains his success.