Founder of the poplar Ubuntu open-source operating system. He was the first African-born man to go into space.
He founded Canonical Ltd. after creating Ubuntu to sell commercial support for his software.
He also founded and sold for more than $500 million an internet security company. He used part of that money to catch a ride on a Soyuz spaceship.
He was born in Welkom, South Africa, his father a surgeon and his mother a schoolteacher.
He and Arlene Dickinson were contemporaries.