Everybody knows Microsoft co-founder Bill Gates, the richest man in the world.
But Microsoft's other cofounder, Paul Allen, has only become famous (outside of Seattle) since he published his memoirs in 2011.
He, too, is plenty wealthy, the No. 55 richest man in the world, worth $16 billion.
With his money, he's invested in a lot of tech companies, real estate, and art. But he's also led an over-the-top life filled with rock and roll parties, collections, yachts, and sports teams.
Can you spot Paul Allen from this famous photo of Microsoft's earliest employees?
He's the guy in the bottom right.
This is what Paul Allen looks like today.
Allen describes himself on his website PaulAllen.com as a "Philanthropist, investor, entrepreneur, Seahawks and Blazers team owner, guitarist, neuroscience supporter, space pioneer & Microsoft co-founder."
He's all those things and more.
He doesn't just party with rock stars, he jams with them.
Allen plays guitar, and has his own band, "The Underthinkers," who cut an album in 2013. Allen wrote or cowrote every song on it.
According to gossip in the Seattle music scene, he keeps several musicians on full-time retainer. They must be ready to hop on a plane and fly anywhere in the world to jam with Allen and rock star party guests like Eric Clapton.
The album featured guest performers Ann and Nancy Wilson of Heart, Chrissie Hynde, Joe Walsh, Derek Trucks, Doyle Bramhall, David Hidalgo of Los Lobos, Ivan Neville, and others.
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