Elon Musk would get very angry when staff at his first company, Zip2, weren't working after 9 p.m.A former Zip2 worker, Jim Ambras, told a new BBC documentary that Musk's face "would turn red."
The Elon Musk Story uses interviews with his family, friends, employees – and enemies – to explain his rise to become the world's richest man.
It was bought by Compaq four years later to boost its AltaVista search engine and netted Elon and Kimbal $22 million and $15 million respectively, according to Ashley Vance's 2015 book "Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future."
Branden Spikes, a systems engineer at Zip2 also interviewed for the documentary, described Musk as an "unusual fellow" who would work late and then sleep under his desk.
Elon Musk's mother, Maye, who also appears in the BBC documentary, said that when he was young she would struggle to wake him up in the morning because he would stay up all night reading books.