Everybody knows Microsoft cofounder Bill Gates, the second-richest man in the world.
But Microsoft's other cofounder, Paul Allen, only became famous outside of Seattle once he published his memoirs in 2011.
He too was rich, and his net worth was pegged at $20 billion. With his money, he invested in a lot of tech companies, real estate, and art. But he also led an over-the-top life filled with rock and roll parties, collections, yachts, and sports teams.
Allen died on Monday aged 65 after a battle with cancer. Here is a look back at his fabulous life.
Can you spot Paul Allen from this famous photo of Microsoft's earliest employees?
He's the guy in the bottom right.
Allen met Bill Gates in high school, where they hacked the school computer to try and help Gates meet girls.
Allen and Gates hacked the computer at Lakeside school to enrol Gates in classes where he was the only boy, Gates told the BBC in a 2016 interview.
It was Allen who first came up with the name "Micro-Soft."
Allen also suggested to Gates that they work together on what would become Microsoft's first product, a BASIC language interpreter for the Altair 8800 microcomputer.
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