The billionaire tech mogul flashed pragmatism and a dose of humility when he addressed U.S. governors at a 2017 meeting, where he warned about the dangers of AI.

Musk's first wife, Justine Wilson, is a fantasy and sci-fi author with whom he had six children. Their first child, Nevada Alexander Musk, was born in 2002 but tragically died due to Sudden Infant Death Syndrome. The couple later had twins, Griffin and Vivian, in 2004, followed by triplets, Kai, Saxon and Damian, in 2006.