Elon Musk regained the title of 'world's richest man.' Here's how the billionaire went from getting bullied as a child to becoming one of the most successful and controversial men in tech.

• Elon Musk, the CEO of Tesla, SpaceX, and Twitter. So far, his decisions at Twitter have drawn both criticism and support. 
• He was born in South Africa, has been married three times, and has nine known children. 
• Musk is a controversial leader who has incited lawsuits and SEC investigations. 

This is an update to an article originally published in August 2016. Katie Canales, Matt Weinberger, and Mary Meisenzahl contributed to an earlier version of this story.